system
Given the following post, respond as if you're commenting on Reddit:
human
CMV Knowingly Having (Mentally) Retarded Children is Morally Wrong

I'm not calling for a culling of people already born, but people with severe congenital mental illness, once it can be reliably detected, should not be allowed to be born.

Having a child with downs, or something equally debilitating, is an enormous drain on the tax payer and the State itself with absolutely no benefit at all.

Particularly when these people out live their parents, it becomes the burden of the taxpayer to provide for their well being. This is both unfair and morally wrong. 

I'm just wondering what the counter argument is to this position. 

As science progresses and we use it to continually benefit the human race, I don't see how it is acceptable to bring a human who is nothing but a burden into this world (When it is COMPLETELY detectable AND avoidable).

Not looking for "My brother has downs and I love him SO MUCH! So you're wrong!" 

But I appreciate all thoughtful responses.
gpt
Many people believe abortion is morally wrong, and no different than "culling people already born"

i don't want this conversation to devolve into the abortion debate, but if you recognize that people have a valid moral objection to abortion, then the conclusion of your title doesn't follow.

Unless you have some other plan in mind?