The best that can be said about the “one in a million” (or less) estimate of vaccine harm risks is that it is merely an idiom. We do not know how safe vaccines are. It is possible that side effects from vaccines are extremely rare, but it’s unclear what that means. It is also possible that side effects from vaccines are extremely common, and that the apologists for this 18th century science are just refusing to see what’s staring them straight in the face. If you were to look at a study conducted in Canada and published in the journal PLOS One in 2011, you would see that vaccination led to an emergency room visit for one in 168 children after their 12-month vaccinations and one in 730 children after their 18-month vaccinations. One in 168? That’s far from extremely rare. That’s drawing closer to autism rates.
Vaccine harm? No, it ain’t rare.