How do you view the UK, as a nation that follows the US's lead in pretty much whatever they decide? Richard Miller

I want you to stop it, I want you to go back to being yourselves. We were hoping, those of us against the war, that you would oppose the war. This doesn't help our cause any when Blair backs Bush on this, it's very difficult for the rest of us in America who are trying to stop this. C'mon, you're called Great Britain, right? You're the United Kingdom, you know. Start acting like it, instead of the dinky little island that you're pretending to be.

What is it, actually, that you do for the "common man"? You make your movies and you write your books and you make your appearances and you line your pockets with the hard-earned bread of the people who buy and attend. But what are you doing? Do you provide any funds for educational programs? Do you send any of that money to homeless shelters or free clinics? Or do you keep all the profits to yourself so that you can become just another fat, jowly middle-aged white guy with scads of cash - just like the Stupid White Men you so loudly revile? Thomas K Arnold

Well, Thomas, I'll assume first of all from your question that you're not from the working class. Ha, ha! Usually I find the only people upset that I've actually made any money are the people who've already got money. It's like, "Wait a minute! One of these working class guys has got money, they're dangerous when you give them money, because they actually do something with it." Depending on the year, I give up to a third of my income away to various causes that I support. I have a foundation I've set up to do this. I've given money to over five dozen independent filmmakers over the years to make their first films. My wife and I support the soup kitchen in Flint, the Better Women centre... A lot of the things that we do to help our home town, a lot of the money we make goes there. It's highly ironic that I've done well... so called, you know, "well", with my work because I never set out to make any money because I've never cared about making any money. The year before Roger & Me, my income tax form showed me making $8,800 for that year, so I lived the first 17 years of my adult life making maybe $10-15,000 a year, that's it. And had a very happy life, I enjoyed that life. So giving somebody like me - who's content to live on very little money - money means that I'm going to hopefully do a lot of good with that money: make the next project, get the next person elected, help out the person who is being harmed by the system, and that's what I do.

What is your next project? Daniel Webb

I'm writing my next book, which will be for Penguin here in the UK. It's a political satire. I've got two films in the works. One's an animated feature and one's a documentary. But the next project really is what I'm doing here in London, doing this stage show at the Roundhouse. It's the first time I've done something like this, so I'm going to give it a shot. It'll be different in content from the movie and the book, but it'[ll be similar in tone.

In your opinion, who is the scariest: Osama Bin Laden or George Bush, and who is the most evil? Richard Clark

Osama Bin Laden participated in the murder of 3,000 people. It is truly a heinous act and he must be captured and brought to justice. George Bush presides over an American military that bombs Iraq already on a weekly basis, that bombed Afghanistan indiscriminately, killing civilians, and is making sure that his friends who have ripped off the American people are not going to go to jail - his corporate friends. Evil presents itself in various forms. If you ask me, as an American, who am I more afraid of tonight, who is more likely to bring harm to me or the people I care about, Osama Bin Laden or George W Bush... well, it's an easy answer. There's a man sitting in the White House that no one elected, he stole that office, and I will keep saying that forever and I will not forget that this happened. We live in a democracy, people died for that right to vote, they died for the right to have every vote counted. It is just appalling that we've allowed him to sit there this long.

Why is the fact that George Bush conned his way into becoming President not a big worldwide scandal? Allan Rutherford

It is astonishing to me, and we're paying the price for it now, because if he believes he can get away with that, he believes he can get away with a pre-emptive strike, something that we as a society, British society, has never really believed is the appropriate response to a potential conflict.

You've been accused of sympathising with those that wish to harm America. Does it frustrate you to be thrown into the traitor camp without a second glance? Jonathan Simmons

But most Americans don't see me that way. I'm a person who loves his fellow Americans and wants to do right for his country. Anybody who would say that to dissent is being traitorous is a traitor themselves. There is nothing more patriotic than to dissent, to ask questions. When you live in a free society, you have to do that, it is required. If you don't do that, you will lose the freedom.

I found your film very overwhelming and thought-provoking. I wonder if you could tell us what happened to the six-year-old boy [who shot a classmate] and his mother? Katherine Byrne

The mother is now doing well, better than before, but the state has taken her son away from her. He, from what I understand, is not doing well and has already committed another act of violence in the new school that he's in.

Do you think that your method of turning up at corporate/government buildings unannounced and requesting a meeting with a senior member of staff puts intolerable pressure upon the poorly paid reception staff and misses the target you should really be hitting? (Other than that, I am a fan!) Matt Smith

Oh no, off camera the reception people are always thrilled to see us, because they're on the lowest rung of the ladder there and they're thrilled to know that the boss man is about to get his comeuppance. When I walk in the door now and the reception people see me coming, they're trying to fight back the smile, because they know it's judgment day for the guy who's been making them work long hours for less pay.

You said on The Charlie Rose Show that you weren't a cynic, but an optimist. How do you maintain your optimism? Jonathan Simmons

I see enough changes taking place, and I see enough good people starting to ask the questions, that it's worthwhile to continue what I'm doing.

In the film, you brought two victims of the Columbine massacre to the headquarters of K-Mart. It was good for them that there was a positive result. However, were you concerned at any stage for the effect it would have on the two boys if not such a good outcome was achieved? Neil Botterill

Yes, and I left that totally in their hands as to whether or not they wanted to go, but fortunately they took a risk and it paid off quite well and it empowered them. I think it'll empower other teenagers, too, when they see this, that a couple of kids could bring down a major corporation.