So, you can look at my comment history to find me waffling about whether every opinion ought to be prefaced with "I believe". Lots of writing advice suggests not doing that, because it's obvious from context and thus redundant, but I find that there is almost always at least one comment like this one when it is elided, which does make me question this writing advice.

Having said that, in this case, I think this is just wrong:

> "people shouldn't", which is a directive/command

I think this is a misreading of the word "shouldn't"... It does not mean "are forbidden to". I honestly struggle to see how you could possibly read it as a "directive/command", especially in a random comment on the internet rather than, like, a legal document (where it wouldn't appear anyway).

I think it's pretty clearly a value judgment, and thus fairly clear that it is a subjective opinion, as all value judgments are.