I live in India. The rest of the country ratio is similar here. We have hit and run cases too, very high profile ones. Not the worst ones come back to ensure they've killed a 3 yr old!

Judging by the ease with which cops in US use deadly force 300,000,000 is also enough it seems. And ISIS is controlling how many couple of million at most - and life there is not highly valued too. It is not the population of the country, but that you know you can get away with something.