I think the ultimate division here is that the people who think lives can be immediately expended if the mind living them decides it's too much suffering are people who don't see the inherent, God-ordained value of the soul within the person, or even believe that souls as a concept of life exist, while the other side that's against assisted suicide does believe in such a concept of inherent, God-given value to every life. I personally think it's selfish to kill yourself because it's the ultimate rejection of all God's given you; not only are you rejecting His gift of eternal salvation and hope, but you're also rejecting the gift of life He originally gave you so that He could then share more of His blessings, but I know I'm not changing any non-believer's idea of life by saying that, since our entire worldviews that contribute to the concept of value to life are what ultimately determine such an idea, and our views of the whole of existence are very firm things, very hard to shift around or replace.