A good friend of mine was in an abusive situation when we were about 14-15. He lived down the street from me. I went away for a summer and when I got back I found out that he had shot his entire family (mom, dad, brother) and then turned the gun on himself. He didn't even get beat, just screamed at.
Maybe there are. But then again, sometimes when you get pissed off and in a rage you do shit on a whim. Or sometimes stress over a week of bullshit can piss a person off enough.
I think it's neat, shit like that doesn't happen all the time. Most people think it's evil, but who cares. It's like an entire family was wiped off the face of the planet because they couldn't get along.