That's only because those countries aren't, in fact, the US. The US is a pretty violent country compared to just about any other first world country. The policing methods employed elsewhere are (IMO) unlikely to work here. It'd be hilarious to send London policemen to Chicago or Detroit and have them "deescalate" things with gangs there.
Well, Detroit and Chicago gangs exist inside minority communities, i.e. not the vast majority of America, including in this particular story. SWATing is not a problem in the hood.