Police biggest issue isn't racism. If it is then Mississippi has the least racist police and therefore the best police. Should all other police departments work to be more like Mississippi? I don't think so, their police kills a lot of people, just that they kill proportionally as many whites as they kill blacks. I think the New York police is doing an a lot better job even though they proportionally kill many times more blacks than whites.
The problem is that the American police kills a lot of people, not that it kills a lot of blacks. It kills a lot of whites as well compared to European police.
There is, however, very real controversy about whether and the extent to which various rights are included in the bundle of human rights; and some of those divide along US partisan lines.
It's not the amount of rights that's the issue, it's what is the source of rights.
Conservatives (and US declaration of independence) posit that rights are from God (i.e. preexist government, if you don't want to bring God into discussion), while democrats view government as the source of the same.
Depending which side you are on, your view on the role of government is very different (protect the rights vs. create the rights).
I think this perspective explains why e.g. Supreme Court Justice position is so highly contested. If your position is that government's role is to protect rights, then judge is just a person who reads the law or the case and tells you if it's aligned with the Constitution or not. If you're on the opposite side, judicial system is just another vehicle to create new rights and laws, bypassing less predictable (due to its representation model) Congress.
