Modern international law is based on the acknowledgement of popular sovereignty, which has an unavoidable "collective" dimension. What's wrong with making the argument that, like most everything else, sovereignty comes with rights but also responsibilities when the country that one's "sovereign" on starts engaging in bad behavior towards others? Average Germans have had to apologize and be responsible "collectively", at least to some extent, for the Nazi regime's atrocities. Was that inhumane, too?

For the purposes of what kind of comments are acceptable on HN, the HN guidelines supersede international law or your interpretation of it. Fulminating at an entire nation is pretty straightforwardly not ok.