I understand your argument, however, if you look at the situation - out of three offspring that were born when the mother was healthy enough to bear them to term
Two are not doing drugs, one is.
With a two to one ratio, the pool is being cleansed.
If the parents die then the offspring are able to be brought up in a household that doesn't have the actions of drug abuse to copy.
The pool gets cleansed, one way or another.
What throws it out of whack though is the number of abortions this woman has had - 6 that I know of - before, between, and after the first daughter and the twins. So at least 6 of 8 pregnancies ended in that and who knows what the fate of those 6 would have been. I'd like to think there would have been intervention to force better circumstances upon them, but reality does not support belief in that ideal. We obviously would have done what we could but it took until their teens for us to get the influence of drugs out of the home life of the ones we did.
She was down to visit just yesterday - wearing her 0bama sweatshirt - though I seriously doubt she bothered actually voting (unless some Acorn type oufit offered her something of value to do it).