The problem isn't testosterone and aggression; it's how often we reward aggression. And we do: We give medals to masters of the "right" kinds of aggression. We preferentially mate with them. We select them as our leaders.
Robert M. SapolskySome Poor grad student pressing on the flanks of a hamster and out comes a doctorate on the other side
Robert M. Sapolsky...when doing science (or perhaps when doing anything at all in a society as judgmental as our own), be very careful and very certain before pronouncing something to be a norm - because at that instant, you have made it supremely difficult to ever again look objectively at an exception to that supposed norm.
Robert M. Sapolsky