Kids should behave.
Traffic shouldn’t be this bad.
I should work out.
I shouldn’t marry someone who’s a different ethnicity.
If you have control over these things, then you’re making choices based on “what will they think of me.” If you have zero control over these things then you’re both delusional and unproductive by refusing to accept what IS.
Neither one serves you. You should (oops:) eliminate these words from your vocabulary.