They're not only not fighting against it, they're proclaiming and celebrating it publicly.
and rarer and rarer the parent who confesses and professes sorrow over those sins he/she repeats continually.
You can't "profess sorrow" over a sin you objectively intend to repeat.
The child of a man and woman who are cohabiting and refuse to marry should not be baptized either, for exactly the same reason.
I would of course make an exception if the child is in danger of death, but anyone can baptize under those circumstances.
I came into the Catholic Church at Easter, so forgive me if I misunderstand, but you seem to be saying that anyone who sins and fully expects to sin again (say, for example, tell a lie) cannot baptize their children in the Catholic faith. Who is able to get between the gay person and his priest or the gay person and God and know the state of his or her soul? I don't recall sinless parents being a condition of infant baptism from RCIA, but I'll go back and read my Schreck book again.