“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.
Because you have never had any formal training on the laws governing use of force, and your worldview is shaped by the opinions of people who have never had any formal training on the laws governing use of force. Unfortunately, with a few rare exceptions (Chris Dorner, Philando Castile spring to mind) the deceased also had no formal training on the laws governing use of force.
Dorner knew them, and committed suicide by cop. Castile knew them, followed them, and was murdered.
It is a travesty that our government only provides this training to police. It should be taught in high-school civics/social studies/government classes, so the general public is aware of when it can use force, and when force may be used on it.
Because you have never had any formal training on the laws governing use of force
Cops' "formal training" includes courses on "kill-ology". They get rewarded with paid vacation and the adoration of people like you. I've run into people like you on reddit. As long as I keep responding, you're planning to fire off one of these pro-murderpig comments every 24 hours or so to see how long you can keep me going.
As with reddit, I can choose to not participate. I'm making that choice. Inflict yourself on someone else. I'm free to leave.