I think the idea of unpersoning someone for nothing more than things they've said is really unnecessary. There's a difference between, say, someone guilty of a serious crime who's fired and blacklisted from their career, and someone who simply said something disagreeable. Even if what that person says is insane and offensive, unless they're actively hurting anyone or it has to do directly with their job, that shouldn't take away their right to speak or otherwise invalidate their objective accomplishments and talents.
James Gunn made some stupid, offensive jokes years ago, and for a time that almost cost him his very respectable position at Marvel Studios. Steve Jobs was a **** to people, so what's going to happen if someone turns up and says that he, say, made an anti-Semitic remark or something? Is Apple going to wipe his name and face from history and downplay his role in spearheading some of the most influential technology of the 21st Century?
What's going to happen in 10 more years when all of us currently growing up have been on the internet and probably said something stupid at some point? Are political campaigns going to be fought and waged based on the content people's old forum and Twitter posts?
It sets an unsettling, Orwellian precedent that nothing more than people's opinions can somehow take away their right to speak or have a career. There used to be a time where people's opinions were just opinions. Now it means you may suddenly no longer have a right to speak publicly or keep your job.