Quote:
Originally Posted by sigmadiva
Because they can't.
I think this another part of the issue with gays getting married. The fear is that if you let them get married, then why stop there? Why not let people marry their pets (this was actually part of an episode on Southpark), sister or openly and legally engage in polygamy.
As noted earlier, this issue becomes a very slippery slope. How do you know when to stop. Because just as gays feel that their rights are being violated, then those that want to marry their pig, sister, neighbor's girls who live down the street will want to fight for the same right.
All in all, the only group who would benefit from all these marriages would be Target's bridal registry. 
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This is actually pretty easily answered -- two adults have the capacity to consent and others are not hurt by their decision to marry. An animal/child doesn't have the capacity to consent.
As for incest, the likelihood of birth defects means that your decision to procreate hurts others.
Gays being married really hurts no one.