You know jolly well that "gay marriage" is a punking attack on an institution that is at least millennia-old if it doesn't date back to the very appearance of homo sapiens (which is not homosexuals). As an unacceptable new challenge, it is recognized. They don't want to just prance around of themselves, which they could already do. They want to force the whole society to treat them as married.
And as science itself has opened up more and more windows on the not-yet-born, it becomes even clearer if it wasn't already clear that abortion is a horrendous mistake.