alt Hacker NewsWe are far more subtle and targeted about it as a whole, possibly due to our social structures.
As vapid as the movie (intentionally) is, "Mean Girls" does a really good break-down of things, and perhaps the main issue is that unlike some other animal groups, people don't always stop.
No. We simply engage in cost-benefit analysis, because we have limited resources.
Entirely wiping out an enemy population can be incredibly risky as they'll try to also wipe you out in response. It consumes enormous resources as people on your own side get killed, your resources get used up, etc. It weakens your group making you more vulnerable to attack from third parties.
Most of the time, it's just bad strategy.
You don't need to invent instincts or tendencies or claim something is more subtle or targeted when the vastly simpler explanation is just that it's all just cost-benefit.