I think I can fairly understand their point - And IMO this is mostly a reaction to liberal circles labelling anyone who does not agree with them as a homophobe. You can't deny that happens since it does happen at some point and ad hominems are not rare (to be fair both conservatives and liberals use them as often). People's brains work differently - I'm interested in knowing why other people think differently than me, but I can't comprehend it scientifically so it's hard for me to judge them. I may be missing something but the only thing I understand is that they're saying they can hold the view gay marriage is wrong, which is obvious in Catholicism, it's a no-brainer - The pope is against gay marriage - It's not a surprise they're promoting their agenda, it's very predictable.
Whoever fights monsters should see to it that in the process he does not become a monster. And if you gaze long enough into an abyss, the abyss will gaze back into you