With all the moral cherry picking Prager does, one has to wonder, what forms the moral center of Prager and people like him? It's not really the heart. Prager veers wildly from urging compassion on one extreme, to explaining that compassion is a construction of "The Left".
No, it's not the heart, it's partisan politics. The current calculation is that opposition to gay marriage still is good for getting republicans elected in most of the country, but hatred of gays now carries a political price. It appears that the time is coming when opposition to gay marriage will carry the same price, at which point he will drop it.