There is a good bit of rape within the UN too. There have been UN officials who have fled the US over rape charges.
And if so, prosecute.
Look I grew up in a garrison town, outside of the US, in a country with really lots of Americans. Surprise, some of them committed everything you could imagine - robbery, murder, arson, theft, rape, assaults, pub brawls, whatever.
And guess what - nobody really cared. The Americans were prompt to clear up their act, the MP was respected and feared (the latter mostly by participants of pub brawls :-), and cooperation with the locals was prompt and smooth.
It is well understood that a large number of people brings along with it their own crime. Matter of life.