“Guilty until proven innocent” is the legal standard of a dictatorship, lynch mob, organized crime syndicate, or kindergartner.
First of all, we’re talking about my personal standard for believing someone. I do not trust people who voluntarily join an institution with a long unrepentant history of racist oppression. Their word is garbage and I require actual evidence.
They chose to become cops. I don’t trust them for the same reason I don’t trust white supremacists. It’s like trusting a babysitter wearing a NAMBLA shirt.