>It's similar to the 99% in hospital meme, which also goes "what single thing causes 99% to go to hospital, what can it be???". That's also false. Nothing says that one single thing would cause 99% go to hospital.
Honestly I've just assumed that it's because the truth would be too much of a shock, that the human mind can't easily pivot that quickly from where 99% of the population is to where the truth exists. So most people would lose the ability to properly care for themselves, however that manifests in their particular case.