there really is no argument against same sex marriage except that one might find it disgusting.
I find fish to be a disgusting choice for a meal, however I am not going to try and make it illegal.
Correct, but we might want to know all the ramifications.
We can never know all the ramifications of anything that happens. You're literally citing impossibility as your standard.
Um, no thank you. You're being unreasonable.
But I gave you an example of something that could happen hundreds of times a day, you argue against them but can't come up with a single reason to deny the access?
Yet nothing you've ever predicted has happened once. There's no sibling same sex marriage. There's no polgamy as a consequence of same sex marriage. Despite same sex marriage having been legal in this country for up to 10 years.
How do you reconcile your impossible standard of 'knowing all ramifications' with your perfect record of predictive failure?
.......and twenty years ago the same argument was made about gay marriage.
And 50 years ago the same argument was made about mixed race marriage.