No, the author isn't saying everybody must work with this person, they are saying someone who is working with the person should not be harassed for that.
> I'm very certain you can find plenty of real world examples of people's careers being ruined without incidents being criminally investigated
So what? As if that makes it okay, this medieval going after the totality of one's person and livelihood. Any and all people involved in such mobs are guilty of worse than whatever they use as excuse for their stonings.