Here's the deal:
It's just the responsible thing for parents & society to encourage what is optimal & discourage what is not, upon which, the facts of record are absolutely clear.
Besides, an extreme minority does not get to redifine (molest) the foundational institutions of society & civilization just to feel better about their particular pet deviancies. THAT would be bigotry.
I say extreme minority because not even a majority of the very small percentage of homosexuals in society actually want 'marriage', not that same sex marriage ever has or ever will be real marriage.
--And if a majority of homosexuals don't even want such a commitment, then what is this really about? Subversion, & the more outspoken crusaders have admitted as much.