But of course he won't sell shares just to pay taxes and then what, pay taxes on the money he cashed out to pay taxes? The point is, even if he sells shares of Amazon, someone else buys them and the money the government takes is no longer available for investment in the economy.
If Bezos would sell more shares, the price would be lower so some of the money would still stay in the real economy instead of entering the stock market.
I would rather he keep the money and create more jobs.
He could also do that while paying taxes

I've seen several articles showing the "trickle-down" economy doesn't work.
Giving handouts has a huge negative effect on the economy and to the people receiving the "benefits". You create a death spiral where you are killing the economy so you can pay someone to not be part of the economy. Then they increase the minimum wage so you have to pay the babysitter as much as you're making by working and people get caught in a feedback loop where staying on the benefits is more profitable than working.
The opposite would be to have very low taxes, very high economic activity with no handouts and people would make good wages naturally because there would be way more work to do than people on the planet.
Somewhere in between is probably the optimum. I do think we pay far too much taxes, but I also think people richer than me shouldn't pay less taxes.