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?
“It isn’t up to me to prove a negative. The onus is on you to prove your assertion.”
Nice try but wrong. Please explain why these genes should be extinct. Sounds a lot like eugenics to me.