You're looking at it from a rational actor side of things though. This guy was immune to facts and logic, anything counter his viewpoint he shrugged off, ignore, or just made some weird bullshit argument. God, guy was an insufferable prick. I'm glad he got his comeuppance at work. Too bad for his kids though, he was vehemently anti-vaccine as well and modern medicine.

I'd say the only permission is for all parties involved to consent, but can you truly consent if you lack the understanding of what the act could cause?