"If you establish and apply the principle that you can kill 'unproductive' fellow human beings then woe betide us all when we become old and frail! If one is allowed to kill the unproductive people then woe betide the invalids who have used up, sacrificed and lost their health and strength in the productive process. If one is allowed forcibly to remove one's unproductive fellow human beings then woe betide loyal soldiers who return to the homeland seriously disabled, as cripples, as invalids. If it is once accepted that people have the right to kill 'unproductive' fellow humans--and even if initially it only affects the poor defenseless mentally ill--then as a matter of principle murder is permitted for all unproductive people, in other words for the incurably sick, the people who have become invalids through labor and war, for us all when we become old, frail and therefore unproductive."