@wjmaggos the "very good reason" is simple... money is not a fixed quantity where in order to have mroe others must have less. Wealth is **generated** not taken.
Billionaires are the most successful wealth generators in a society. So having them means a lot of wealth is likely being generated (not always, but usually). Destroying the wealth generators and distributing what money they created therefore might temporarily feed a few people but plunge society into poverty long term.
The reason poverty levels plummet as billionairs become more numerous is because a society that has a lot of well performing wealth generators makes all of society wealthier and has been shown to significantly reduce poverty levels.