jackk, Chagigah is also talking about 3 simanim of a shoteh:
walking at night by himself (putting himself in danger for no reason and, maybe figuratively, staying in the dark from facts)
sleeping in the cemetery (not accepting norms of behavior?)
tearing clothes apart (refusing bodily protection and again behavioral norms)
Also people with foul odor are exempt – not because of themselves but because they are annoying others.
still, I don’t think we will have vaccination clinics at Beis Hamikdash. Just once during yomim norayim – mi b’magefa …