I wouldn't know, I'm not American. But there is these little thing called statistics that show that, even though our police in a worse state than yours, our country is in the middle of a separation and we have a real problem with illegal immigration, we have more than four times less homicide than you.
I'm not sure how those are related. There is an illegal immigrant problem in the US, but it really has nothing to do with gun related violence in most cases. The problems are basically job related and people don't go shooting each other for that. (If you get that impression, you are sadly misinformed and maybe that's why you are so anti-gun.)
Gun violence in America is violence that would likely have happened, gun or no gun (IMHO.) The only way you can use statistics that compare firearm to non-firearm violence is to show how many of those offenders were able to get hold of a firearm. Now the fun part of that statement is that it's pretty easy to get a firearm in the US so guess what? The stats show higher gun related crime. Wow!
If citizens were able to carry weapons on them at all times, it's projected through the same statistics you keep holding up that less gun violence happens in those areas with more
legal gun presence here in the US. Now, if you compare Detroit/Chicago to those statistics you'll see that the gun violence goes up because it's illegal for anyone to carry. Thus, guns become a power tool that nobody else can legally use and those who remain legal are at a disadvantage... and it's known by the criminals.