Central banking destroys the middle class little by little. Disproportionately hurts the poor and those on fixed incomes. The financial sector, the stock market, and the banks become bigger and richer because they have access to the money and credit first. All artificially propped up. Add the promise of bail outs and it is a complete house of cards.
Too much money and resources get shuttled into the financial sector, which means less capital, resources and productivity in sectors that the economy actually needs.

It's not because of the tax system. Taxes just send more money to the government. The government spends way more than what it takes in. Artificially low interest rates discourages savings. Savings is where real capital comes from. Artificially low interest rates and credit expansion leads to over consumption of resources, massive debt, and highly leveraged business models.

Simply taxing rich people can't solve the problem of finite resources.