If you cruise around the internet, engaging with the anti-vaccine religion (not recommended), you will pick up on their standard tropes, lies, and other anti-science commentaries, like the claim that vaccines cause diabetes. Of course, once one digs into the scientific facts, you find little supporting evidence.
A lot of the vaccine deniers believe that vaccines cause a lot of everything and several claims that vaccines cause Type 1 diabetes (or here), based on little evidence. As far as I can tell, this myth is based on the “research” from J. Barthelow Classen, M.D., who has pushed the idea that vaccines cause type 1 diabetes, through some magical process that has never been supported by other independent evidence.
In another example of the anti-vaccine zealot’s cherry-picking evidence to support their a priori conclusions, they ignore the utter lack of plausibility supporting any link between vaccines and Type 1 diabetes. At best, Classen has cherry-picked statistics to support his predetermined conclusions, “comparing apples to oranges with health data from different countries, and misrepresenting studies to back his claim.”
Moreover, Classen seems to come to his beliefs based on population-wide correlations that rely on post hoc fallacies, rather than actually showing causality between vaccines and diabetes. It’s like finding that a 5% increase in consumption of Big Macs is correlated with a full moon. Those two things may happen at the same time, but it would take a laughable stretch of real science to make a cause for causality.