Per capita is a pretty useless stat. I'm much more interested in why there are particular cities where being stabbed is much more likely than in my rural village, per capita.

Cities are generally worse because that's where the organized crime is, and a nasty spiral of people carrying weapons because other people are carrying them.

Scotland used to have the worst reputation for stabbing until the https://en.wikipedia.org/wiki/Violence_Reduction_Unit incredible success. You won't hear about it in England because it reflects well on the SNP.