No idea about USA, but in Poland a large number of those refusals is due to catholic bigotry. In Poland this is correlated with many fundamentalists choosing t

No idea about USA, but in Poland a large number of those refusals is due to catholic bigotry. In Poland this is correlated with many fundamentalists choosing this field due to readily available prey. Should be easy to determine comparing the number of refusals between the fundamentalist states and the rest, I guess.