Genes are rarely about inevitability, especially when it comes to humans, the brain, or behavior. They're about vulnerability, propensities, tendencies.

Give lab rats oxytocin and, according to that meme, they get better at talking about their feelings and sing like Joan Baez.

Individual differences in testosterone level predict very little about differences in aggression.

The fascinating thing about our best and worst behaviors isn't the behavior itself - the brain tells the muscles to do something or other - big deal. It's the meaning of the behavior.

What happened in the milliseconds before a behavior to cause it? That's in the neurobiological realm.

Some Poor grad student pressing on the flanks of a hamster and out comes a doctorate on the other side

If you live in a baboon troop in the Serengeti, you only have to work three hours a day for your calories, and predators don't mess with you much. What that means is you've got nine hours of free time every day to devote to generating psychological stress toward other animals in your troop. So the baboon is a wonderful model for living well enough and long enough to pay the price for all the social-stressor nonsense that they create for each other. They're just like us: They're not getting done in by predators and famines, they're getting done in by each other.