But they are not careless from their own point of view. I daresay they are more intensely passionate in seeking out the latest knowledge in their own field than your average family physician. Breaking out of an inculcated intellectual and epistemological framework is an almost impossible feat.
I would make an analogy to veganism. Vegans as a whole are more intensely interested and passionate about their health and what they eat than your average healthy omnivore. For that reason, they're also more likely to proselytize and promote their ways to others. It's my belief that in doing so they potentially bring harm to themselves and to others. Do I think they should be engaged in vigorous debate and their arguments refuted to the best of scientific knowledge? Yes, absolutely. But I don't think treating them as idiots or malefactors is well-deserved or productive.