I think everybody is missing the point of the OP.
It is not the film per se, but the general slackness and pure irresponsibility of the film-making industry that is making it more acceptable to a minority of young people to act like total sickos.
Has everybody forgotten about what happened to Jamie Bulger? And how his murderers were influenced by a seemingly innocent "comedy-horror" film. Yes, it was a rare case, but it still happened.
I work as a young journalist in the entertainment industry and am subjected to an enormous amount of films, videogames and music of all genres. The producers and distributors of these titles generally don't care about the welfare of children, they just want to shift units. As a result, what is getting put out there is becoming increasingly more violent to keep up with what is becoming more acceptable.
RichRichRich is absolutely right - it is totally unacceptable to portray one child setting fire to another child.
I have seen Eden Lake as I had to review it for a publication. Yes, it was graphic and shocking. But the the device the director used to make it morally shocking is the very one the majority of replies to RRR's post seem to be humouring.
In Eden Lake the director is saying: "look at the state of our kids today - and don't you think we should examine why they are like that..." For those who haven't seen the film, they should before lambasting RRR's post.
The other shocking thing about Eden Lake is that it is very real. There is no fantasy in it - it is, essentially, a drama. Any kid with the wrong parenting or who gets in with the wrong crowd could very feasibly be influenced by the film.
As for the freedom of speech/censorship issue? I think it is perfectly reasonable to deem minors torturing others offensive and therefore suitable for censorship.
They are banning parents filming school nativity plays FFS, but it's okay to put stuff such as Eden Lake on general release?!
I, for one, think RichRichRich did a responsible thing by bringing up the issue with his MP and being brave enough to throw it onto to MN too.
We all moan about the current state of society and what we are bringing our kids into, but at least he is doing something about it.