I guess that makes sense as to why they're so rabid about the jab. They have a sense of loss, and no longer feel like they "belong". So their solution, rather than try to search out remedies for the damage they've done to themselves is to become zealots for the shots and try to force everyone else to get it too so everyone's equal again.

Just like that Aesop's Fable about the fox that lost his tali in a hunter's trap and, after hiding in shame for awhile, then tries to convince all the other foxes that cutting off your tail is amazing and they should all do it to be just like him.