One day someone will have a say in his old age whether or not he is a contributing member to society. What will he say then, if he can. Human life is precious and to protected at all costs. It's beyond disgusting.
Sanctification of human life is an asset to society only as long there is agreement between its members to promote and maintain order, war allows for neglect of the principle as does want and famine.
Singer's biggest "sin" is equating perfection with utility.