"Substituted the own judgement"? They certainly used their own judgement; that's their job: to use their judgement and create laws. That they listened to the testimony of an entire parade of medical professionals is right and proper. But in the end, it's the legislature that has to make the call on matters of law; not the doctors.

I can only think of two alternatives here:
Either (1) we forbid that congress pass any law keeping any doctor from doing anything because, after all, the doctors judgement is better than congress'. Or (2) we declare that a group of unelected doctors should henceforth make all the laws relating to doctors.