I don't think this proves that "humans crave violence just like sex". It doesn't even prove that mice "crave violence just like sex"- only that mice seem to get a reward out of fighting, and that their brains process various rewards in simialr ways.
It was an extremely clever experiment. I was reading along thinking, "yeah you took this rodent dude's girlfriend away and gave him some nastly male that likely looked looked like trouble, so he fought. So what? Then the clincher- the little guy had a button to push to get his sparring partner back! Which he pushed, over and over! My kind of rodent for sure!
Of couse this whole thing is no surprise to anyone who has ever been in a honky-tonk on Saturday night, or who hasn't replaced experiential reality with platitudes and the way things are 'sposed to be.
In fact, this board is pretty good proof that people love to duke it out, at least virtually. If the mods would leave us alone it wouldn't take long for this place to resemble a barfight without the blood.
I loved to fight when I was young. I only gave it up when I was old enough that knives and stuff might be along, and when I started to really care about what others, like higher class girls, though of me.
Typically lower class girls love a little bloodshed on their behalf, and are not above trying to bring that about. But not so the daughters of suburban Republicans.