The very sad and dangerous issue is, they don't seem to care or grasp the fallibility of their subjective judgment. Some even turn to ridicule as an argument, which of course is irrelevant and obstructs the search for truth.
Without truth, we are doomed. We only spin our wheels, sometimes excitedly, sometimes frantically, sometimes confidently - but it's all a waste of time and labor. We go nowhere; we gain nothing; we are in the same place tomorrow as today (or we may go backward). We don't even know what problems there are or how to solve them.
(The claim that existing members benefit also needs evidence: Existing members express feeling very overworked, which doesn't corroborate the claim, and most analyses I see say the the money is going to the insurance companies and the hospital owners and managment.)