Which US city north 250 000 has not had or had only one police shooting resulting in a death by the police officer's gun?
Wouldn't you want to compare population density of those 250,000; crime rates, socioeconomic levels, drugs, race, number of firearms, number of mentally ill, etc, etc? Again, not to mention historical factors.
I'll do the research on those officer-involved shootings since the 40's, though, if someone can give me an idea of which US cities of 250,000 or higher have similar population densities to Iceland as a basic starting point.
I mentioned the population difference as a hint of the sorts of differences that would need to be compared. My point wasn't at all that it was as simple as population. It was just meant to be a springboard to start thinking of how difficult a true comparison would really be. I apologize if I didn't make that clear.