As for the crime rate, a lot of that comes with population. The US has a population of 325 million people. Japan has a population of 126 million. Canada has a population of 37 million. Then you get to the European countries, their population figures are also in the tens of millions. So it would make more sense for the US to have more crime. However, crime in the US is currently the lowest it has been in decades. There are pockets of areas with high crime rates, but that can be blamed mostly on incompetent politicians in local governments.
Crime rates are usually done in crimes per 100k people or something like that, so the population has already been accounted for and is therefore irrelevant. The US just has a lot more crime per person than other developed countries.
We've talked about this in years past, what is the big difference between the US and the countries you're comparing them to?
I know this site is based out of the UK originally, but it's always fun to see the ignorance on display from our European friends. Comparing Mississippi to the UK or France.
While densely populated, people truly forget how large the US is. California has just as many people in it as Poland and the experience there is so incredibly different from those living in other parts of the country. If you want to make an honest comparison, you have to compare the US to EU proper. There is so much difference in what states want the role of government to be that it's kinda insane to compare them. People listing gun control as an issue the US needs to tackle, whereas parts of the country are in total favor and in other states, you have people who think there are more than enough laws already on it.