If we allow same sex marriage what will we say to other groups who demand equal consideration for their reform of marriage?<quoted text>
How did it go that for him the last time he used the Slippery Slope argument?
Let me explain it too you. Scalia believes that we have a right to legislate morality. He argues it to the point of ridiculousness (his own words.) Should we allow murder because we have no willingness to enforce ethics? The big problem with such an argument is the logical fallacy. Murder has a victim where as other types of moral/ethical behaviors do not. What's more, ethics and morals have traditionally been legislated (turned into law) on the basis of acceptable social standards. These standards change over time and from place to place. Not long ago we had such standards which justified racial discrimination. Our Constitution requires us to give all citizens equal protection and due process. Two people are allowed to marry. Man and woman equals two. Man and man equals two. Woman and woman equal two. Each can be married as a couple, one at a time. It is a contract between two people regulated by our laws. Poly is more than two people and is against our current laws. One plus one plus another is greater than two. It is a separate legal issue. The slippery slope fails because it is both a fallacy and a hypothetical.
I say we should respect and consider them. You say we should flat deny them equal rights because their cause is "not valid".