It's a damn shame that any 'free' country censors this stuff, or anything, for that matter.
To be perfectly fair here, in the US at least, nothing is "censored". It's not illegal to buy or sell any of these games. It's the policy of the game stores in response to pressure from parents and other consumers. I really don't see any problems with it. Should a 10 year old be able to walk into a store and buy a porno mag?
There's a difference between a government "censoring" and a society self-restricting. Most of the people I see ranting about restricting sales to minors are, in fact, minors themselves.
That said, Jack Thompson is a general all around douche and should be disregarded for the loon he is.