I don't think it should be banned at all, I don't think all the crimes nowadays are linked to the game, pretty pathetic excuse.
Anywayy my nephew' got the GTA's and the new one and he's only 4 lol
He doesn't play on any games for his own age and he isn't aggressive/naughty whatever, he gets told whats right/wrong etc.
And my lil sis plays it and she's 9. Films on the other hand though, they wouldn't be allowed to watch films that wasn't suitable for them.