“Just be a decent fucking human being” = let me do more communism. Always.

My response would be “assume that people are self-interested, then run the simulation”. We’ll see which worldview offers the most predictive power.

Another way to say it would be this: in the history of the world, at no point has “everyone just” done anything. So if your ideology depends on “everyone just” doing something, then your ideology is doomed.