As if the job was all that mattered.
We are social creatures. Shunning and ostracism have a significant impact, even when happening by people we don't know, especially when it's a pile-on.
I'm not saying there's never a reason to shun someone. If people do something terrible, cut ties with them. I don't think that's what a lot of this is, though. If it was, it wouldn't happen on such flimsy evidence and it wouldn't happen to people others don't even know.
Most cancellations are a blood letting, where people are trying to feel powerful and the cancelled (or even the wronged) don't really matter.