Even though I believe that the anti-gay marriage argument that you've cited does constitute an appropriate response to the pro-gay marriage argument, I'll give you another one anyway:
"Those who engage in incestual relationships are people, too, and should be able to get the same recognition from the government as non-incestual people do for their commitment to their partner."
If you have a problem with that statement, then your support for gay marriage is hypocritical.
