Probably becasue a human life is much more than a commodity to be bought or sold or a trophy of *prefection* to wheel around in your stroller to show off to everyone so they can ooo and ahhh over your perfect little selected designer creation.
Fortunately, the Holy Spirit has instilled the nature of right and wrong into some of us, so we don't feel the need to ask sophomoric questions such as those tendered donnishly by ivyleaguebrat and timm22.