> Differences within the populace with regard to risk tolerance and perception doesn't tell you anything about systemic issues.
How we deal with it as a society does though - some people don't mind going fast but we as a society decided to impose speed limits on roads, especially around schools. Some people don't mind the smell of cigarettes but we as a society decided that indoor smoking shouldn't be allowed in general. No one likes paying taxes but as a society, we accept that we need it to function, however imperfect the process may be.
This is where US feels like a dysfunctional society when viewed from outside. If US views occasional mass-shootings as a non-issue, sure. But if it does see it as a problem and it's not able to deal with it because for whatever reason (culture, freedom, constitution etc.), I think that's a problem.