Yeah I always get a bit sus when they fall back on fear tactics too. Makes me think they don't have any more rational arguments in their favour and I feel manipulated which is a bit irritating.

Research on vaccinations is supposed to be scientific. If "refusers" are more likely to have a tertiary education, then they're probably more familiar with the way research is conducted, written up, the bias in what gets reported, how to critically analyse information (often contradictory information too) and weigh everything up in a considered way. Medical professionals would get much further with this group (IMHO) if they presented both sides of the debate/evidence/knowledge etc and left it respectfully up to the parents to make the final decision.