Crime's drop begins in '93 and ends around '00, and it has dropped some, increased a bit, but really has plateau'd. So the really violent games which came out post 2000 definitely seem to have had very little impact on crime, positive or negative. But some people just love to bring it up.
This is true. I just got the new Mortal Kombat game back in April and I've killed way less people than usual over the past few months.