Aren't Catholics the second largest religious group next to protestants? I think any group promotes their interests, it's a natural behavior in human societies - You can find all sorts of groups promoting an ideological agenda. Since they can't ban gay marriage, they need to find alternatives, and the first is ensuring being against gay marriage is seen as a valid ideological position. They're also playing the reverse-oppression card - This is what happens when one group who was traditionally oppressed revolts against the oppressor and becomes the latter itself - It isn't what is happening right now, but people don't care about facts so their message will stick.
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
