As you already know, Budge, the ones who speak out are either ignored (if they don't have a strong public following) or demonized as a "crazy doctor," "crazy anti-vaxxer," or a "nutty conspiracy theorist."
Generally, they are effectively cancelled. The whole Plato's Allegory of the Cave playing out in real time ...
I'm surprised you know about those MDs who died at the Mississauga hospitals and North York General Hospital - Mississauga and North York are parts of Greater Toronto - my wife just mentioned that story to me yesterday, actually.
From my understanding all four mentioned in the story were quite young (50s, from what I remember) and in good health.
More to come, unfortunately ...