> They believe, wrongly in my opinion, that vaccines cause other medical problems serious enough to justify not using vaccines. To me, that's legitimate dissent.

I don't get it. How is this any more legitimate than actually being a Luddite and saying "technology and modern medicine is bad"?

Would you say that racism and bigotry against minorities becomes legitimate if it's phrased as "this minority group will give you a disease if you let them near you"? Because that's actually a pretty classic feature of racist propaganda.