On irremediability, two things are going on.
One is for the patient and one is for the clinician. The patient decides what treatments, if any, they're willing to try. Then the clinician says, “Here's what I understand about whether that will or will not work.” That's a clinical choice, but whether the person wants to take the treatment is a moral, personal choice for the individual.
We have to think about incurability similarly. We have to think about them as having different roles, and ground them in the expertise each one has. The patient has expertise in what constitutes suffering to them, what their values are and what gives them meaning. The clinician has expertise in what a treatment can do for this condition—the trajectory, and so on.
On safeguards, I would say we don't have evidence that there is any risk of what you mentioned, in part because I have not seen the evidence some of what we've heard as described as harms and abuses. I don't believe it's there. It's how people are reading things. I think that with safeguards, we absolutely can.
The other thing I'd say is that we're already doing it. If we think we don't have adequate safeguards, then we need to be changing a whole bunch of other things we're doing, including advance directives, substitute decision-making in ICUs, and final consent waivers. All of those are premised on having safeguards that are adequate. Those same but enhanced safeguards will do the job.