The dog shit vaccine analogy kind of works, but here's a different take.

You and your friends have been told about a new ice-cream shop that has opened in your town. You get together and start heading there.

Along the journey there are many signs on lampposts warning that the new ice-cream is just frozen dog shit and to avoid the shop. Some of you notice this and try to warn the rest of the group.

Some of your friends refuse to accept these warnings though, saying that there's "just no way an ice-cream shop can serve dog shit"

You get to the ice-cream shop and there's a big sign saying Free Ice-cream Today! The friends that ignored your warnings rush in to get their free ice-cream.

They come out and say that the ice-cream wasn't a nice experience, they feel a bit ill from eating it, but despite that you should still get some because it's free and helps support the ice-cream shop. By not getting one you hate local businesses and are a horrible person.

They simply can't and won't believe that they are dog shit. And now that theyve argued with you about it, they feel morally obligated to keep going back.

The issue that I think a lot of people are having is that trying to argue with these people won't ever work. They made their decision to get vaxxed out of compliance not logic. You can't tell a slave to leave their master. And if you attack their master, they will attack you.