Earlier quoted context omitted.
Police in the U.S. are in no sense surrounded by violence. The United States in 2014 is one of the safest, least dangerous societies the universe has ever known.
American cities are the most dangerous in the developed world, by a large margin.
Um, can you give a source on that? I rather doubt it's true, but probably depends on what you mean by "most dangerous". (And also perhaps "developed").
Here's an article titled "Violent crime worse in Britain than in US": http://www.dailymail.co.uk/news/article-25671/Violent-crime-...
Or here's PolitiFact:
> For England and Wales, we added together three crime categories: "violence against the person, with injury," "most serious sexual crime," and "robbery." This produced a rate of 775 violent crimes per 100,000 people.
> For the United States, we used the FBI’s four standard categories for violent crime that Bier cited. We came up with a rate of 383 violent crimes per 100,000 people.
[Source: http://www.politifact.com/truth-o-meter/statements/2013/jun/... ]