Is incest the reason why people get upset about gay marriage?

So I was thinking about that other thread, and I had an epiphany. The reason why people get upset about gay people is because incest is the next target, and it will be a lot harder to explain why incest is wrong. We've already won the fight of black civil rights, then women's rights, and now gay rights. If we end up winning the fight for trans rights, then we'll be on to poly love rights (which is forbidden due to incest). <br><br> Edit: I posted this in r/relationships and it was so crazy people called my post the "dumbest one on the internet".