i think it depends on demographics... kids of "decent" population, whether wanted or unwanted have more chance to stay more or less on the right path than kids, wanted or unwanted of, as you put it, crackheads.
eugenics is genetic selection based on... well, genes. Selecting whites vs blacks or yellow vs brown. Not based on social status. If the social status is low, abortion would be better than raising a poor human being who'd be forced to the streets at the age of 8 to feed themselves selling crack cause their parents are drunk somewhere. This would be the case for all races and eye colors and statute, etc... I don't see the connection of this with eugenics. But in allowing parents to choose gender and eye color of the future kid while going thru IVF - there i see it:-@