People have egg allergies and can’t get vaccines unfortunately. Then you have the nutters that won’t take vaxxes and then here we are.

The people with allergies are a tiny fraction of the population, and they're one of the reasons why everyone else should get vaccinated. The other reason is that none of the vaccines are 100 percent effective. The tiny percentage of the population who can't get vaccinated, and the people for whom the vaccine didn't fully protect, are much safer if the other folks are vaccinated because the virus can't get a foothold, so exposure the up being negligible. Say someone comes in from another country that has an active infection. If all the people who that person encounters are protected, then the virus stops with that person.

The problem is that the number of people buying into the anti vaccine garbage is now nontrivial, so that herd immunity is out the window, and these previously well controlled viruses are now able to spread.