Then given the sacredness/importance of human life, relative to the value of someone's hair, there is no reasonable justification for not requiring every airline passenger to shave their head before entering security, if it reduces the probability of the scanner having false negative even by a small margin.

Come to think of it, there's no justification for allowing passengers to keep their clothes on as they pass through security.

That is the endgame. Together with every human spending their life in a small isolated cage. Perfect security.

Perhaps we should submit travelers to regular cavity searches, because I know someone who would smuggle contraband (including phones) into jail through a certain orifice.

I will never discriminate against someone for something they can't reasonably change. But discriminating against them for something they consciously choose is totally fine in my opinion.

Cool story bro.