"we don't want to let people end their life humanely because I think I know better than them about their life. Instead they can end their life inhumanely anyways." - I rewrote what you were saying to make its intent clearer.
Patients aren't always rational actors. In the US at least, doctors have < 25 minutes per person. There are well documented biases in medicine (try getting your tubes tied as a single woman) and my concern is that it very easily veers into eugenics territory. If we can't treat something why not screen for it in utero and terminate pregnancies with appreciable odds of developing terminal or chronic diseases with no known cures?
That's an option that always exists. I simply have a (much) higher threshold than you in regards to a state killing its own citizens.
This sort of framing is not helping the discussion at all.