I work with people with disabilities. I think saying you would want to die if in that state sometimes betrays an ignorance of the quality of life that people with severe disabilities can have. It can also betray a sort of unexamined prejudice that the general public has towards individuals with disabilities.
I used to think the same sort of things until I began working with these individuals.
Just a few years ago, there was widespread hoopla about the right brain-left brain research. Now some researchers are saying the whole brain is involved in thought patterns. Not all that long ago, research was more concerned with the neurons themselves--now researchers are discovering that the connections between the neurons may be the key to understand thought patterns and memory. Not long ago, many scientists believed that certain types of neurons were incapable of regrowth if damaged. Now there is evidence that this could be wrong.