I have a friend, and once discussed this matter with her. She would abort a baby if she found out that this baby would be mentally challenged/sick, or would have a severe handicap. She calls its the survival of the fittest. She said if everyone would do this, only the ones with good genes would survive. Mankind would not have to spend all the money that is used to take care of them, overpopulation will be reduced, and it would benefit mankind overall. I thought it was just cruel of her to think that way! I could not believe my ears? Are there more like her?

This would have no effect on overpopulation as the world isn't plagued with deformed people. Uneducated women without access to birth control is a bigger problem.
If a human is mentally challenged and can never achieve that, or so sickly that they could never last long enough to grow up and achieve that, they're worthless.
And yes, I am advocating the destruction of stupid people. I imagine the pulp that used to be their bodies could be used as a fine glue to build our bridges.