"What do you do with someone with an allergy? What do you do with someone who's immunocompromised, or someone who for religious reasons.or deep convictions, decided that no, they're not going to get a vaccine? We're not a country that makes.
At any given moment there is an orthodoxy, a body of ideas which it is assumed all right-thinking people will accept without question. It is not exactly forbidden to say this, that or the other, but it is "not done" to say it, just as in.