That's a much better way to go than the one he heroically fought against.
Really? Have you ever seen anyone die of ALS? There muscles go, usually their legs and feet first, over a period of years, gradually everything becomes paralyzed and they can't even speak and eventually they stop breathing, in other words they suffocate to death. They face a long period of time when they can't talk or move and they look at you and you know they are in there, but they can't communicate. It is a horrible way to die and if this guy wanted to go that way, fine, that is his business.
Others however, may choose not to suffer that way and decide to die before it gets to that point, it is their right to do so, and no business of anyone else.