Typically it is expected that sovereign states resist attempts at undermining their sovereignty.

Expected by who? The original comment I replied to said that Danes offered no resistance to Nazi occupation, as if that were to be expected without stating why.

some of them, very bad.

Maybe you're mixing that up with Poland? Nazi rule in Denmark was popular and internment camps there we're similar to US ones of Japanese, Italians and Germans, and similarly in the US there was no resistance either.