“If you’re infertile, shouldn’t those genes go extinct?”
Why SHOULD they?
Wait, wait, let me go down the street and tell the IVF kid he shouldn’t exist. Is that all right with you?
Why SHOULD they?
It isn't up to me to prove a negative. The onus is on you to prove your assertion. However, do you believe we understand the human genome so thoroughly that we can safely say certain gene expressions are worth preserving, when apparently our genetics disagree?