Sadly we're mostly wage slaves in the US and so while we might like to spend all day every day standing outside of the police department shouting or marching in protest we'd quickly lose our jobs, our homes, and perhaps die from the lack of employer provided insurance that makes the medications we need to survive barely affordable.

The system is rigged very well to prevent meaningful sustained protest by keeping us chained to our work for 40+ hours a week, keeping us eating and surrounded by poison to make us sick, and by only giving most people enough money to get by paycheck to paycheck. We're allowed to accumulate debt to keep ourselves entertained though so that when we're too tired to protest from overwork we can still sit in front of large TV screens while we stare at our tiny phones designed to keep us distracted and disconnected from the people around us.

Our best bet is to wait for those brief moments when we're allowed to cast a vote for someone else who doesn't represent our interests.