Rich people are needed in our current system to provide money for literally everything because rich people, as a group, control and hoard all of the money.

If they didn't hoard all of the money, they a) wouldn't be rich and b) wouldn't be needed to provide jobs because there'd be more money in circulation.

Money doesn't come from rich people. They are not money trees. Money comes from the government and rich people hoard it so that the only way you and I can get money is to work for them.

The reason the money matters at all is because people need food, water, shelter, clothing, medicine, and community to live, but all of those things currently require money. Hoarding the money is equivalent to hoarding the necessities of life. We are destroying oversupply of food while people go hungry. We have vacancies everywhere while people go homeless. The whole system is organized by rich people against everyone else to prevent everyone else from having life's necessities so that they are all compelled to work jobs for the money that the rich people hoarded explicitly so that you would starve if you don't work for them.

Rich people aren't necessary in all societies, just the ones organized like ours.