In the secular world (religion aside), there are many disability advocate groups that want to promote that living with a disability (even the really severe ones) is still worth living. Well, ok that's those people's prerogative to say that. However, not everyone agrees with them. I'll even go on and say that if I were ever severely disabled to the point where everyday functions, tasks, and things that most healthy, able-bodied human beings take for granted, then I'd want out. I don't want to be taken care of, I don't want to salvage whatever else is remaining in this life, and god forbid, if I'm in a situation where I am even unable to physically suicide (quadriplegia, ALS, late stage dementia, etc.), then I'd want to die. Otherwise, I'll just cause as much trouble as I can IRL (well fuck morals, ethics, and law at that point because if society and government won't respect such a basic wish to die with dignity, peace, then none of the constructs matter anymore.. It doesn't pay to be a good person at that stage - someone might disagree with me but meh, my two cents.) until I pass. Mini-disclaimer: Not advocating for illegal activities of course.
@AnnaJaspers summed it up pretty well in the last sentence.