don't get me wrong. it's the s e n s e l e s s violence that disturbes me, the killing of people without a reason. i've played "wolfenstein" a couple of times and i really like it - but all the time i was hunting down nazis and not cops, prostitutes and innocent...
Then don't play it. Case closed. Bye, now.
Most of the targets in GTA aren't innocents. Contrary to popular belief there is actually a plot in the games, not a very deep one but a plot all the same. In these games most of who you're killing are criminals (gang wars are the general setting for the game), if you're in a position where you're killing cops you probably screwed up and will need to reload your last save. Yeah there's some purely wanton mayhem in them, but that's aside from the plot and the players doesn't have to do it to have a complete and enjoyable game experience.