Very strange work conversation..

So tonight at work I over heard a conversation that completely struck me as the most ignorant thing I have ever heard. One person was attempting to use gay rights to justify incest relationships. Stating that if the LGBT community is able to marry and love who they want then why can't family love and marry family. I just stood there shaking my head.. wondering if this person remembered why incest was illegal in the first place and I had to bite my tongue from interjecting. But I am curious as to what some of you ladies think on the topic. I keep seeing that the CC is dead and needs new topics. Well here's one for ya. Incestuous relationship.