You know, I mean... that's a fair point. "Unwilling medical experimentation" is probably more moral than the death penalty. At least the experiments have a chance at producing something good instead of literally throwing a life away.
Seems like you could write a pretty decent philosophical argument along those lines. Human rights are either alienable or not.
Those are the exact arguments people use against capital punishment. Well it's a slippery slope problem. If the government has the power to execute people, surely the most absolute punishment since by definition it cannot be reversed, why can't they do other things?
I'd rather be injected with some GMO flu virus than Midazolam.