The legal phrase I like is "knew or should have known". If there is a situation where you should have known something was wrong, it's as bad as if you really knew it was wrong. To hold otherwise incentivizes willful blindness and plausible deniability.
I don't think the fact that the law (rightly, I will grant) unified two things when determining whether to punish means that we should always unify those things in our reasoning in other contexts.
