When the gay gene is detectable by amniocentesis, the gay activists will be fire-bombing abortion clinics.
If such a thing could be identified.
I kind of doubt that it could. I think with enough applied research, sets of genes that would increase the likelihood of falling into that sin might be found, but we would likely also find those same genes represent a temperament of child that is a greater challenge to raise. A child that is more sensitive and that has greater spiritual capacity than most, and when frustrated he (or she) seeks satisfaction in “idols” which the devil opportunistically presents. Raising the spiritual awareness of society in general will head off a lot of these tragedies (which God can still remedy, although in later life).