The thornier ethical/political problems surround the embryos that are discarded... A living organism with human parents is, at least in some sense, a human. To

The thornier ethical/political problems surround the embryos that are discarded... A living organism with human parents is, at least in some sense, a human. To "discard" one on the basis of a disability while giving another a chance to live can be construed as a philosophical cousin to some of the most dangerous forms of discrimination. Especially in America, where the right to life movement still holds a lot of political and religious/cultural sway, this will be an especially hard sell...