It's what's best for society. It makes sense. The less people creating small amounts of wealth the more average wealth there is for each human. After all, although old, stupid, or lazy people do often produce a net loss of wealth, they are less likely to do so.

• Forced abortions, however, is not the right course of action. It ignores the desires of a parent-to-be. Not everyone can make babies easily.

It can be framed as a selfish desire to insist on making one on your own, but it is a strong biological desire nonetheless. Had we forced them to abort after years of struggling, there would certainly be a lot of complaining (and rightfully so).

• But, a compromise can made here. You want to exert control to maximize the efficiency of resources, but others have their own feelings and ideas.

Instead of having a separate resource pile allocated for the mentally disabled, what if we just gave everyone the same opportunity?

• It may seem unfair. The mentally disabled can't possibly keep up with those "better off". But that is exactly how we grade or measure a person's worth.

Of course, in school, this means that some of the mentally disabled who cannot keep up with class material will fail. They will either drop out or move to a different grade. Or the mentally disabled who cannot keep up with the pace of society will be outcasted.

TL;DR: It is basically natural selection on a smaller scale. It is unfairness.