I agree it can be career-destroying. And in the cases where the public makes a decision that is counterfactual--when they believe a smear that is not true--that obviously is a miscarriage of informal justice, as it were.
Where we disagree, I think (the specifics of this case aside; I don't think the public reaction in this case is counterfactual) is in precisely what moral "should" applies to such public discussions.
Does the risk that the public may be misled mean we should have no open discussions of accusations of criminality? Clearly not, I think--especially when it comes to miscarriages of the formal system of justice, transparency is the only recourse. (Imagine how different our discussions of criminal justice reform would be if we did not have access to statistics showing the racial imbalance in the American justice system!)
So what's your exact claim here? That the whole thing is unseemly? I guess it is, a bit. (Would it be less so if the alleged crime were less prurient?) But are you suggesting this should not be on Hackernews? (I don't have a strong opinion on that; this place isn't my playground, but rather someone else's.)
I guess it's not clear to me what you're exactly arguing. (And conversely, my only point was that in general there's no clear stricture against public accusations of criminality, as long as they are not defamatory, and that in general society probably benefits from those who are unsuccessful in the legal system being able to make such accusations publicly.)