Here's a nice little walkthrough for when you should call the cops:

Severe Injury/medical emergency -> No, you should call an ambulance.

Car Crash -> Fire department and ambulance

Mental Health Crisis -> Community healthcare network. 211 in most communities, or find a local community group dedicated to that care

Fender Bender -> Get yourself to a collision centre. They don't give a shit.

Crimes -> You can try the non-emergency line, but they're not gonna show up or even call back. Enjoy being on hold for 3 hours.

Someone who's an active danger to the public -> That is the cop.

There's no reason to call the cops, or for them to exist in the first place.

@mayintoronto the car crash/fender bender thing is a problem with the systems in place, you need a police report to give to insurance so you need a cop
@aburka yeah, that's why you go to the collision centre. Bureaucracy gonna bureaucracy. Don't hang around waiting for street cops unless if they're there.
@mayintoronto I'm not sure we have those in the states but that makes sense
@mayintoronto and the one time I've been in a car crash and called the cops they literally submitted a blank report, so we got fucked over by insurance, I'm not saying it works it's just what we are taught to do and there's no alternative currently