They're ruining the lives of these children. But I guess it doesn't matter to them. Children are the result of heterosexual activity. Homosexual activity can't produce children. This is one of the many ways the gay lobby "gets even" with heterosexuality for being normal.
Oh, lots of activities don't produce children. Mowing your lawn doesn't produce children. Buying a new car doesn't produce children. Pretty much anything that isn't artificial insemination or heterosexual sex doesn't produce children. What do you have against activities that don't produce children?