Letting everyone vote is pointless unless everyone is responsible, intelligent, informed and productive.
It’s overwhelmingly obvious that most are not.
See. e.g., Seattle, Portland, NYC, etc.
Putting the profoundly stupid (DeBlasio, AOC, Harris, NY Gov Cuomo, NJ Gov Murphy, PA Gov Wolf, etc )and senile (Pelosi, Biden, Ginsburg, etc) in positions of power isn’t working out so well