I'm not sure that Negan and his gang really care that much about genetic diversity, and perpetuation of the species. They seem more like 'instant gratification' type of people. But, I haven't read the comics so I may be missing pieces of the narrative.
Nay_Sayer: “Nothing is impossible if you dream big enough, or in this case, nothing is impossible if you use a barrel of KY Jelly and a miniature horse.”
Wiser words were never spoken.
Wiser words were never spoken.