I understand your point, but you fail to realize that comments like "why are you surprised?" induce a kind of digital bystander effect: they're essentially defu

I understand your point, but you fail to realize that comments like "why are you surprised?" induce a kind of digital bystander effect: they're essentially defusing moral outrage via social proof. If you read a comment like that, you may think to yourself, "well, this originally seemed like something worth loudly protesting, but if everyone already knows about it, then I guess it must not be that big of a deal." It has the effect of numbing outrage regardless of the outrage's merit, and I can't see how that's productive. If you feel that the outrage is in fact without merit, then attack that on logical/rational grounds, not by appealing to social proof.