Can you substantiate that, or is it just your opinion? You can justify the imposition of your opinion on everyone? (Through violent intimidation?)
like building systems that do not give cops the power to murder people without accountability
This has happened, incrementally. Can you design a system, ground-up that will work as well as the current one? I suspect that's far more likely than iterating on the current one. That's also an opinion.
Do you have statistics that show that? Are more cops charged and imprisoned after murdering unarmed people every year, or does the number of unarmed murdered people go down, at all? People who die mysteriously in custody?
https://www.washingtonpost.com/investigations/fatal-police-s...
However, the overall trend in police killings is flat.
https://mappingpoliceviolence.org/nationaltrends
Interestingly:
“White Police Officers Are Not More Likely To Shoot Minority Suspects”
https://www.npr.org/2019/07/26/745731839/new-study-says-whit...