Right along with other bullshit superstitions like astrology.

There's mountains of data that shows what happens when everyone who can get vaxxed, gets vaxxed.

There's also plenty of data that shows what happens when people start to forgo vaccines for things that were previously contained, such as measles.

This isn't "fortune telling". It's an educated guess. That guess could be wrong, but it's not at all without significant merit.

All this shit is about percentages and likelihoods, not absolute certainty.