Earlier quoted context omitted.
In my limited experience not all countries do think like this.
It's a cultural thing yeah. Americans genuinely do on the whole think that their approach is better. The good news I guess is that if you're an American and you think "Well I don't" you can (at least for now†) just leave. † If you lived in the German Democratic Republic (aka "East Germany") in 1950 you could literally just walk to West Germany, by 1961 all other borders are closed and fenced and in Berlin the Wall is…
Enforcement on individually shipped imports is hard regardless of where you are. Traditionally enforcement is through spot checks of bulk imports, and leaning hard on the importer who has a clear nexus.