I don't think the "issue" of bystander's feelings about suicide are relevant, whether they feel better, or worse, about someone taking their life. It really shouldn't be relevant to the discussion.
The three areas that need to be more central imho are:
1. Legal/moral issues of assisting others to die; especially if a right exists to suicide, there is an implied obligation on others to render assistance. Ie. can anyone and everyone realistically be obliged to help someone die? If not, there is an implied problem with the action; because people cannot be obliged by the argument of necessary assistance for what is a legal right, if what they are being obliged to do is something bad. (Following the law, or orders is never a defense in wrongdoing).
2. Philosophical acceptance of hopeless situations. While medical impossibilities are real, psychological impossibilities are arguable. To accept suicide on the grounds of impossible improvement in suffering/depression enshrines a philosophical outlook, which contradicts the implied outlook of medicine, including psychiatry - that treatment should be attempted.
3. The legal/moral issue of enshrining a right to suicide. A right should be universal; that if it is acceptable for anyone to do something, it is right for everyone to do something. Obviously, if a large number of people are suffering (eg. during times of war, recession, ecconomic depression, etc.) it would not be right for a vast percentage of the population to suicide.
Personally, I think you cannot implement a "right to die" legally, without opening too many contentious issues. Rather, I think that, as at present, if someone wants to kill themselves they're gonna do it. And if someone is too incapacitated to do it, palliative care - even with a superabundance of pain killers, or even semi-illicit drugs should be the go-to option. Perhaps, the legalisation of certain drugs in palliative care could be explored.