The problem with your argument is that you think its the government's responsibilty to legislate morals. Its not. Its the job of the family and religious affiliation. To legislate morals is the same as legislating religion as that is where morals come from. Are there existing laws that are based very much on religious morals? Yes. There is also a law in a town in MD that no monsters are allowed in the city borders and another in MA that states that all women drivers are to have their husbands in front of the car waving a flag to warn other drivers and pedestrians. Just because the law is on the books doesn't mean its logical or even enforced.
Also, this is not about repealing laws, as right now its a state issue. This is about creating NEW FEDERAL laws that prohibit homosexual marriage. So no laws are being repealed, they are being created to deny rights and legislate morals that should be kept relative to religion and personal belief.
And by the way, if brothers and sisters want to get married... more power to them. Incest between two people has nothing to do with me or anyone else besides them. After all, what right do we have to tell two grown people whats right or wrong if all they do affects only them? Thats for God and themselves to sort out.
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