I can't understand why so many people are against someone dying with dignity. This is a form of harm reduction for not just the patient, but also their loved ones, and society in general.

Nobody wants to see their loved ones suffer endlessly or needlessly, and this is also a whole lot less traumatic than people committing suicide. Nobody wants the last memory of their loved ones to be the scene of their (potentially messy) suicide.

And that's not to mention the trauma inflicted on bystanders for some of the more public suicide methods (not to mention that jumping to your death or intentionally walking into/driving into traffic has a decent chance of physically injuring or killing said bystanders).

If this process is undertaken with care and compassion, it's far less likely to be traumatizing to all involved. And it prevents "spur of the moment" decisions, like many successful suicides are.