Death is permanent and cannot be undone. Once someone dies they take all their love, potential and beauty with them. We can only live with the memory of it, but that memory doesn’t have the ability to create new things or react to life in new ways.
That said, people should be able to end their suffering in a dignified manner of their choosing without suffering more. No one asked to be alive, it’s a burden imposed on them by the will of the living. The least we can do, then, is to make living as devoid of suffering as we can for everyone.