Counterfactuals are always slippery, but I'm not convinced the death toll over the course of a century would have been any lower.

But over and over I keep coming back to the same key point - bad things happen when sociopaths end up in power.

Overt politics are irrelevant. It doesn't matter if a sociopath pretends to be a fascist, a communist, a libertarian, a Christian fundamentalist, an Islamic fundamentalist, a corporate executive or a social democrat.

Sociopaths cause poverty, death, and destruction.

We have limited experience of cultures and corporations which aren't run by sociopaths. I'd suggest getting more experience would be a good start.