Several of those games are already made...
1. Ethnic Clensing - racist
2. Massive Mayhem - suicide bomber game
3. Columbine Game - kids shooting at school
There probably is some game with naked kids and rape too. (torture and murder, well, that's quite a big chunk of games really...)
I guess the trouble you could get into is lots of media cover (not really that bad?), some outlets refusing to sell your game (you can always sell it yourself) and maybe some guys picketing in your front yard, and sending you nasty letters.