Voting for Democrats is also voting for those that give power to the rich. But this must be looked at in the larger context of the U.S. political system, which shows that it’s not a problem of voters but of the essence of the state itself.
All of the issues in your analysis were explained over a century ago: https://www.marxists.org/archive/lenin/works/1917/staterev/
Clearly you weren’t talking ab the U.S. or implying the legitimacy of U.S. democracy.