There comes a point where a switch flips in your head and a cop becomes just Some Guy With a Gun — as opposed to a special symbol of authority that commands obedience (beyond a basic sense of self-preservation in the presence of a dangerous person).
The spell is broken. When you’re the only person who feels this way, it’s isolating and kinda dangerous. But when you’re part of a crowd that feels this way, you’re powerful. When enough people break the spell, well, it’s all over for the cops.