Seems you look at it from a supposed to be rational point of view. OK, put emotions aside, let's be rational: "Are you sure that it is beneficial for the survival of human kind to promote the increasing overpopulation of the planet?" :-)

I see it like this: every individual has an intrinsic value independently from his (or her) ability to produce descendants or not. According to your logic one had to save gays an old people last ... What would you answer?