With regard to feeding the metaphorical crocodile, I think such a mindset is counter productive. What do you think will happen to the parents attitudes and their children when you push them into a corner?
I understand that this is meant as a rhetorical question, but: all other things remaining equal, I'm willing to bet that if society at large can now be more inclusive of lgbtq people than it was during the 1990s, any such parents will face increased marginalisation if they choose to fight that particular battle, and will be worn down accordingly. If they harm their own children by their actions, they won't exactly have been unique in being bad parents; what is important is that they are not further empowered by those institutions that have a duty to their children, and to the children of others.
You can debate what effect it has had over childhood development and sexual behaviour but to ask such questions doesn't automatically make one a prude or a homophobe.
Pointedly making the distinction between the sexuality of people and the sex they have may not technically make one a prude or a bigot, but its regular use as a rhetorical device by the latter makes it difficult to ignore as a heuristic.