This is not the question I asked. I asked how and why would it be better for the rest of us?

For the record, I’m not necessarily opposed to the idea of taxation on the wealthy, but I want to understand why having no rich is better for everyone.

Extraordinary claims, etc

Fair, and I don't believe we'd be better off if they fled. We would be better off if they weren't astronomically wealthy. I don't have a specific number in mind, but "a billion-ish" feels like a reasonable upper bound on wealth.

I'd also note that I would prefer to adjust tax/accounting laws to prevent the accumulation in the first place, not just roll out a blanket "take everything over a billion-ish law" as that feels more like a band-aid than a fix.