It is actually very difficult to compare nations in regard to crime.
People tend to use nations like Switzerland as a point of comparison. Switzerland is a strongly homogeneous society with limited immigration (very few "undesirable" immigrants). Most of Europe is like that. Culturally, European states are more nationalistic and movement was not possible historically (it is now, but Europeans still hate each other). There is much less diversity. That goes beyond the Swiss as well. Nations like Finland, Norway, Denmark, and other supposed paradises are all societies that are composed of rich "whities."
Plus, there are theories that US violence, which most often occurs in the US south, is a result of European culture of "honor." Reputation and honor are considered to be more important in the south.
But, yeah, that is pretty much how it is. Claiming that other societies are somehow better is generally wrong. It only works if you support nationalism and elitist societies that hate everyone.
Lets take a look at other European countries with stronger gun control laws... where the crime rate is lower. Or Asian countries, like that of Japan. The homicide rate in America is shockingly high, and this is because of lax gun laws and gun culture. This is an unavoidable fact. Thanks, palemale for that link.
Except,
[Text: Removed], crime rates (violent crime in particular) are higher in Europe than the are in the US. The US murders more, but even those rates are declining. Japan is a great example, too. Well, as long as you consider a society where rape and sexual assault is almost commonplace (Japan has specific words for various types of assault; "chikan" is public groping).
The reasons for crime are not simple though, so, again, direct comparisons are very difficult to make.
I think there should be a greater role for family members to contain people who are a danger to themselves or others. Subject to oversight and due process, but not the false presumption that liberty is automatically better for someone with crisis or chronic mental health issues.
Except,
[Text: Removed], that most people who are mentally ill are not a threat to anyone. Those who are a threat are normally a threat to themselves (which should be accepted and allowed in all cases).
Your desire to strip freedom from people who may want to hurt themselves is sickening. I am planning my suicide now. Moral authoritarians like yourself make that very difficult. I cannot discuss it openly or kill myself in a clinical setting because society says that I have to live.
One has no right to harm others without their consent, but it is never unacceptable to harm oneself.