PoAC: Gay marriage vs. polygamy

In a friend's journal, someone I didn't know responded to a comment of mine by quoting stats reflecting a high percentage of gay relationships that involve abuse, and questioning whether my comments about culturally-sanctioned abuse in traditional polygamous marriages could also, therefore, be applied to gay marriage. This is my response, posted for your perusal and comments.

( Another explanation for the stats about abuse in gay relationships, aside from the traditional Christian explanation, which, being circular and based on the idea of divinely blessed marriage, is not that helpful. )