. It's like saying that blacks and women shouldn't be allowed to vote, because then that opens for kids and animals given the right to vote, too.
If you say one group is able to redefine the definition of marriage but you say no to the others you have a 1st Amendment and 14th Amendment situation on your hands.
Does the US have a 1st Amendment and 14th Amendment situation on its hands for redefining marriage to
- Allow divorce.
- Disallow spousal rape.
- Allow inter-racial marriage?
- Allow inter-religious (is that a word?) marriage?
- Allow marriage between social classes?
- Disallow arranged marriage and instead make marriage something you agree upon for love, not for the family economy (a major shift, if you were not aware)?
The words 'redefining marriage' makes it sound as if marriage is some sort of constant. It isn't. It's been tweaked and redefined so many times throughout history that you can't possibly point to any given state and say that 'this is traditional marriage'.
As long as you are a consenting adult (see, no children allowed in), feel free to marry another consenting adult. You can try to equivocate gay marriage with polygamy and child marriages all you want, but it won't fly, as we know they're different things altogether.