It's not that people hate police, it's that the police have zero accountability and that, over time, has lead to a culture where they can do whatever they want, whenever they want. The police are rife with systemic abuse and even a HINT of "oh maybe we should be looking into this" is met with "back the blue" type people crawling of the woodwork to explain how qualified immunity is good, actually, and we don't want good ole boys going to prison for things as trivial as state-sanctioned murder.