Unless your in the medical industry you really cant understand all that entails. I have a dea license allowing me do what i do, should i lose that or any other requirement i will no longer have a job in this field, anywhere.. the consequences of not covering your ass in this industry are perhaps the harshest of any. And the population has no clue what goes on behind the scenes making matters worse. No doctor or whatever would purposely deny you something they believed would benefit. They are good people, becoming a doctor doesnt make you loose ideals and crap...
Not all doctors are good people. In fact, as a profession it has the highest % of sociopaths in a study I saw not too long ago. Most of those unfortunately reside at the top of the food chain in positions of power. A lot are surgeons as well. I've met more than a few having grown up with doctors around me most of my life, including at least one in my own family.
So, yeah, as a rule, most of them are well intentioned. However, they are also human and most humans will subject to threats of punishment (over 80%) and those who offer those threats are generally sociopaths. So, the profession as a whole has a major credibility issue with this particular subject (amongst others).
That 80% who submits to these sociopaths (I'm basing that number on prior psychological studies done indicating 80+% of folks will do almost anything if threatened harshly enough by entities they believe to be powerful) would be a lot better served fighting their current system and speaking out against it in the long run, but too few people are willing to take the risk.
There are doctors who will do the right thing, bureaucracy be damned - or even more, my own doc takes the position that he will fight the bureaucracy or my dad who just doesn't give a shit what the bureaucracy thinks, he does what's right for his patients. Yes, he has a quite a few MMJ patients - in part because of the field he's in (digestive health).
Unfortunately doctors who do the right thing are not large in numbers. And isn't necessarily because they're evil people - although those who are forcing them into a tough decision certainly are - but it's because they are fearful of their own livelihood. Which is an incredibly human reaction.