Schools have a lot of local autonomy and are among the easiest institutions to influence, for non-rich citizens. Getting your local schools to include more coverage of rights when encountering the police in the curriculum is among the easiest outcomes to pursue as far as changing what “the government” is doing.
… if enough other people in your local community agree with you.
Sorry but the citizens of Detroit don't select the school board in Alpena. Too many Americans focus on a Presidential election every four years that gets decided by a couple hundred thousand people in 4 or 5 states and ignore all of the elections that actually impact their day to day lives.
Get involved in your local elections, even if only becoming an informed citizen. Those are the elections where you can make a difference.
… if enough other people in your local community agree with you.