> Why don’t the poor people vote to take all the money away from the rich people and redistribute it amongst themselves?

It's because the Powers That Be don't put it on the ballot. If you put "take 99% of the money from the 1000 richest billionaires (about $10 trillion, I think), and nobody has to pay any income taxes for the next four years" on some sort of national ballot, I think there's a very good chance that it would pass.