

And we already have a safety valve for when conventional ethics is standing in the way of vital research: the researchers test on themselves.
https://en.wikipedia.org/wiki/Self-experimentation_in_medicine
If it’s that vital, surely you would do it to yourself?
It’s not terribly common because most useful research is perfectly ethical, but we have a good number of cases of researchers deciding that there’s no way for someone to ethically volunteer for what they need to do, so they do it to themselves. Sometimes they die. Sometimes they make very valuable discoveries. Sometimes both.
So the next time someone wantz to strap someone to a rocket engine and fire it into a wall, all they have to do is go first and be part of the testing pool.
Eh, usually less than you would expect. We’re really good at math and are quite capable of making synthetic experiments where we find people who either require the procedure, or where it’s been done incidentally and then inferring the results as though deliberate.
We can also develop a framework for showing benefit from the intervention, perform the intervention ethically, and then compare that to people who didn’t get the intervention after the fact. With proper math you can construct the same confidence as a proper study without denying treatment or intentionally inflicting harm.
It’s how we have evidence that tooth brushing is good for you. It would be unethical to do a study where we believe we’re intentionally inflicting permeant dental damage to people by telling them not to brush for an extended period, but we can find people who don’t and look at them.