Have you ever been employed by someone poor? (And I don't mean a middle manager spending someone else' money)

The rich have historically funded the arts (e.g. patronage), public buildings, public institutions (e.g. Carnegie's libraries).

Useful businesses that require high capital are difficult to get going if no one has any capital.

Government has funded those things way more, but when a rich person runs a museum it's "philanthropy", when the government does it it's a "waste of taxpayer money".

There's no reason the government couldn't fully fund those things instead.

In fact, "businesses that require high capital" are almost always funded by the government. It's called infrastructure spending.

Rich people moving to Bermuda doesn't mean they move their company incorporation there, just means they have a house there and fly in and out.