Both empathy and the lack of it are required. Humans are pack hunters. We work best as teams. Someone has to lead those teams. Guess what traits tend to make for people better at securing and conserving power within groups, and keeping loyalty within their ranks? Yep, you guessed it! Psychopaths! :D

There are benevolent leaders, yes, that exists, but in a competition where anything goes, a psychopath which is difficult ton detect will have the advantage over someone with more empathy and robust moral limits.

There's a reason why they're roughly estimated to be around 10% of the population. Hierarchies need few leaders. The higher the ladder, the more vicious the psycho it gets, because they'll have to be competent enough to defend themselves from the other psychos that want all their tasty tasty power.

The reason why all our leaders are psychopaths is this is the same reason why basketball players are all tall. If you don't have that trait, you just don't get the fucking job (edit: unless you're like REALLY good at it despite your disadvantage).

This used to depress me, but I chose to stop thinking about it. I don't think there's any fixing it.

Libertarianism doesn't deny empathy and "pro social behavior" (as an autistic person, I rarely see it toward myself, not being liked and not making right faces - apparently not deserving of it, but OK ; it's already good if those "pro social" people don't consider it normal to steal from you when they don't like you), it actually relies on those more.

The issue is that it's something that needs scale and consistency. You can't just assemble a bunch of idealists and crooks and expect them to make a working mechanism.

I don't think there were many more successful attempts by left anarchists.