I think you’re framing this wrong. Hitler deserved human rights, as in if captured he didn’t deserve to be tortured to death. However, people who exist outside of society cannot participate in society, so they need to either be jailed for life (or until rehabilitation, which doesn’t exist in the US) or killed if they can’t be captured. US police in the current iteration exist outside society, so they can’t be afforded the mercy that society provides to its citizens.