Except we live in a world with others, and some of our actions affect others. It's a nice sound bite to say you're "pro-liberty" or freedom or whatever nonsense, but I'm sure you're not "pro-liberty" when it comes to performing obscene acts in public where your children can see them.

Issues in life are not simple binary choices. We have to think about balancing individual goals, societal goals, national goals, and global goals. I'm of the opinion that we should err on the side of individual liberty, but when the evidence is so overwhelmingly positive to be pro vaccine, then obvoiously we might have to re-arrange our priorities.