> Pretty much every country that tried to tax wealth had to back up exactly because of wealthy and capital flight.
No, mainly because of the risk of capital flight.
> It's exactly this kind of people that you will alienate and drive away with these of wealth-hostile policies.
I disagree. If a good or service is truly valuable, someone will provide it. The value of an unmet need will increase until it becomes attractive, and if it never meets that bar, then by definition it wasn't valuable enough.
The only exceptions are goods or services that capitalism isn't effective at solving anyway, either because they are common goods that capitalism would exploit to exhaustion, or because they would yield only natural monopolies that are rife with abuse. A state-run corporation is a good option here, and wealth flight isn't an issue.