

The idea is that you absolutely should not have hierarchies and other systems that put individuals into power, as those will inevitably be usurped by bad faith actors, or even more likely, corrupt those granted the power.
And how is this state of being enforced? Narcissists will not just obey the rules because people said so. They will create hierarchies without anyone’s consent, and they have a wide variety of methods available to them for doing so when presented with a naive population (which I still maintain that leftists largely are, at this point).
Even if you somehow maintain a non-hierarchical state, but do not remove the narcissists, you will still end up having to deal with the social and psychological damage that narcissists do to everyone around them regardless of whether or not they have any kind of special power over others. Why would you want to tolerate this?
What you propose will just result in a witch-hunt with a lot of collateral damage
Only if you mis-identify the bad actors. Part of educating people about how to reliably identify these people is also teaching them how to not mis-identify someone who is not one of these people.
power corrupts even those that are not narcissists to begin with
This premise is actually just false. The psychology and anthropology makes it plainly clear that power does not corrupt - it merely reveals who a person really was all along. If you actually understood narcissism, you’d understand how they mask their personality so that people don’t realize just how self-centered and abusive they are. When you give narcissists the ability to avoid accountability (something that typically comes with power), they loosen or even take off the mask because they no longer need it to protect their status, and it is a lot of effort for them to maintain.



The first hierarchies were not accepted by the people at large. They were enforced by narcissistic individuals taking over the food supply and coercing all of the people in the area who depend upon that food supply to serve them. Only the narcissists at the top accepted the hierarchy, and they accepted it because they were the beneficiaries.
Only because the positions of power are already full of other narcissists. These “powerless” ones are the ones sitting in reserve, waiting for their opportunity to be on top - and doing enormous psychological damage to everyone around them while they wait for that chance.
“Goliath’s Curse” by Luke Kemp is most of it, but “Hierarchy in the Forest” by Chrostopher Boehm adds some nice details about how egalitarian we were when we still had the ability to effective police these individuals. I would also recommend that you have a look at the works of Dr. Ramani to see just how much damage these people do just with interpersonal relationships: "Don’t you Know Who I Am?, “Should I Stay or Should I Go?”, and “It’s Not You”.