I was wondering about that too. But what I mean by "responsibility" is that the ideas presented have a definite form and don't get to evade criticism by being mercurial and shape-shifting. Not sure about art, like fiction. I'm not seeking to prevent authors from being ambiguously provocative, but it's a crappy way to reason.

Yes, that's why modern literature and media dealing with diverse opinions are terrible now.

You are expected to caricature and refute people saying "bad" opinions in the work itself since otherwise the reader could believe in those opinions. Leaving something open to interpretation is tantamount to endorsement.