It's the other way around though: it's not them or their creation that is killing the patient, it's the virus. There's a big difference between their creation being unable to save the patient and actively killing them.

That's the thing with giving people stuff that hasn't been tested on anyone before: It might actively kill them, not just not prevent them from being killed by the virus.

That's a very optimistic viewpoint. In reality, it is certainly possible that their creation could kill the patient before the virus does.

If everyone always demanded the "best" treatment according to our current knowledge, we might never find out there was anything better than leeches...

Informed consent of X or X's health POA determines what happens, not random doctors.