A diagnosis of PVS means a doctor did not find any sign of cognition. Three doctors, hired by Michael, didn't find any because they didn't look very hard (looking seriously for signs of congition requires more than an hour exam, but none of Michael's "doctors" spent even that long). Two doctors hired by the Schindlers spent longer describing Terri, and were able to describe specific signs of cognition that they found.
The notion that 'majority rules' diagnosis makes any sense under such circumstances is absurd. It would be analagous to a drug smuggler arguing that since three of the cops searching his property didn't find any drugs, and only two of them found drugs, there weren't really any drugs.
Completely irrelevant to the subject of the thread. Unlike you, I am not a medical specialist is this area. So I will defer to your judgement on Terri's PVS diagnosis. The basic issue, though, is the evidence supporting her decision (or not) to not continue with tubal feeding. And it hardly equates to a Nazi purge.