Doctors go to school for many years. This is not because they're slow and take extra years to get through the tricky bits. That's why lawyers take extra time. Doctors are a crafty, clever, and ultimately greedy folk.
They're using their Science and their Studies to back up their claims that Becan is bad for you. It's all part of their long term strategy. If they can convince a sizeable segment of the population that Becan is undesirable, then there will be more Becan for the doctors.
Evil Geniuses...