I got the numbers from Nation Master and another numbers I got was:
Number of crimes by nation:
USA 11,877,218
UK 6,523,706
Ger 6,507,394
Frogs 3,771,850
Do you realize if you add all the people from UK, Germany and France and would be way less people than US (310 millions) but with more crime? We have more diversity than all the 3 nations above, we have terrorists from extinct central/south american armed groups who moved to US and they blended with a lot of gangs in LA for example. That most of the murders are between gangs but you can't say the same in Europe.