Great post, but the US population is only about 318 million, not 400 yet.
Also, while I do agree that the vast majority of cops are just trying to do their jobs, and that the stupid trigger happy ones that should have never been hired are in the small minority, there kind of is a culture of corruption within police departments where cops look out for each other to the point of breaking the law. One could say that when they have each others' backs, it's almost like they have their own street gang. In some police departments, especially urban ones, some cops also do have an attitude that they can get away with harassing blacks and even beating them without repercussion. It's been like that forever, but nowadays such cops are becoming more cautious. This is the age of the Internet and video recorder on smart phones, after all. Watch the movie
Serpico with Robert De Niro and then imagine that same corrupt New York police department in the age of the Internet.
Still, Davius points out (in another thread too) that out of some 640 killings by cops this fiscal year of 2015 thus far, 24 of those have been
unarmed blacks. I think we'd all be happy if that number was 0, but we don't live in a perfect world. And yes, some cops are actually murderers who even try to cover up their crime (i.e. planting a gun on the victim when there was none). However, that's not an everyday thing. That is truly rare. What is an everyday thing is urban gangland shooting and killing in the US, mostly black-on-black violence, but there's plenty of trailer-trash whites killing each other, and Latinos killing each other (not so much the Asian Americans, though, lol). Some politicians are smart enough to realize that guns mean different things to people who live in the city, especially bad parts of town, than they do to people who live in the suburbs or out in the country. Rural and small town folk in tight-knit communities just want to go hunting or do recreational gun range shooting with their friends and family members. It is nearly unfathomable to them that the government would "want to take their guns away" as they so often chant. There has to be some sort of compromise, though, because it's hard for rural people to understand the horrific violence of the inner city and how that truly is affected by the access to guns. I'm sure that gang members would still be killing each other with knives and bats and whatever they could get their hands on, but their task would be much more arduous without a TEC-9 or Colt .45.