- Let's say A earns $1000 day and B earns $20/day. If A was force to give $20 of his earnings to B, this 2-person society would be better of. Because the standard of living of A would decrease slightly but the standard of living of B would increase significantly.
- There's a rich get richer and poor get poorer effect.
- Lot of wealth gain is a result of pure luck. Wealth redistribution serves like an insurance policy. Examples: bitcoin mining, finding a gold mine.
(Of course, there are lots of negative effect of wealth redistributin. What I'm saying is that the optimal level of w. r. is higher than the current level.)
But - while I know that the society would be better off, as a developer I would be worse off, so to be honest, I'm not really in favor of higher taxes.