There is some justice in the world.

[Colonel Olrik]

As for the whole vigilante justice thing, all I can say is that if one of my friends had gone out and done something stupid after I had been raped, it would absolutely devastated me. Violence does not solve violence.

I think this is a basic instinct too hard to overcome. If my girlfriend, sister or a close friend got raped by someone I knew, the guy could start praying, because I'd confront him. Being deadly serious, it's one of the things that touches more deeply in a man. Our emotions concerning the women we love or are very fond of are very strong and uncontrollable.

[The Yosemite Bear]

Besides the primal instinct to spread our genetic component as far and wide as possible, we have this deeply rooted socialogical component that says we must protect and stand in harms way to preserve the child caring/carrying components of our community/pack. This instinct is a primary one in the males most social animals. Other solitary animals will kill and canabalize the young of their own species that are not their own progeny, and cat's and Spiders in particular will commit rape.

Wolves and Primates and Dolphins tend to react very violently to attacks on the females of their community/pod/pack/troop by others outside or associated with their community. Further in human society it's been pretty well ingrained in us through training.

after all I see my sister, my mom, my niece etc. Even when it was a girl I didn't even know behind the theater when I was in college, I still reacted as if it was my sister or my cousin that was under him. (infact it wasn't until she told me to let him go that the rent-a-cops were able to detain the fucker, thus was the grip I possessed on his neck)