Sure agree that it is mainly our egos that can't imagine the nothing before we are born and the nothing thereafter. A fierce need to go on somehow, anyhow, is that barrier to help us get out when we've lost our brain, or our mobility, or independence, or basic functions, etc.
Can we ever come to the point of accepting death as part of the life cycle and take matters into our own hands when all quality of life is gone? We can go to the moon, go to Mars, chart our genes, etc. but not this. Sometimes I fantasize I'll find a civilized way without going to jail and that will be a parting gift. There can be terrible, terrible suffering at the end. To what purpose?