Sorry, yes, I meant physical harm. Physical and irreparable harm. Sure a misdirected twitter mob can cause emotional or professional harm. I indirectly know a few people it happened to and they deserved it.
Let me be clear: there are multiple actual murders and lynch mobs that were the direct result of someone starting a rumor online and it snowballing from there.
How many of those are acceptable? You're dismissing this with "oh chucks most times they are right as opposed to always wrong" when we aren't arguing they are never right.