"Widescale redistribution of wealth demonstrably doesn't work"
There's never been a "demonstrable" case of a society dying from absolute wealth redistribution/equalization.
Soviet Russia collapsed due to ongoing famines because of Lysenkoism. Had NOTHING to do with redistribution of wealth. It had to do with agricultural malpractice by a conman.
...and even in that system, wealthy politicians and elites were getting most of the redistribution. Just like in Western Society today. So you really have no clue what you're talking about when you say there's been societies collapse from "too much equality".