The problem is you're implicitly saying that ANY discussion is a pointless waste. As there will always be people on one more sides who see any other views as illegitimate per se. And there will always be people on all sides using "clickbait"-style tactics to sway people who lack critical thinking skills.

I refuse to accept this premise. Even if some (or even most) discussion is disingenuous or low-quality, I refuse to believe that anything positive can come from declaring any discussion topic forbidden in the public square.