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That is true in the U.S., but there are plenty of country where the cops do protect civilians.

In most case, it is the same countries that give adequate training to their cops, a not-so-surprising correlation.

I expect that the frequency of violent crime is predictive of police behavior towards crime.

When it's rare, then it's easy and reasonable to take a highly idealistic approach. When it's frequent you have to deal with uncomfortable practical issues like whether an officer should prioritize your survival, or their own. There's a line where heroics turn into suicidality, and that's largely driven by frequency.

Not all countries are like the US

Police protect through deterrence

Through violence & zero accountability.