Perhaps because pharmacists used to actually mix medications and even produce pills they still jealously guard their authority to decide what it is that patients actually need.
Since I've never had a prescription filled for myself, I was incensed the one time getting a prescription filled for my 96 year old mother proved a pain and changed pharmacies on the spot. It didn't occur to me that uncooperative pharmacists might be a wide-spread condition. If it had, I suppose my mind would not be blown by this report out of Florida.