People argue and debate about what they believe to be true every day. And even reasonable people can be wrong on a variety of issues.<quoted text> I have never seen that in any legal definition or SCOTUS opinion. Perhaps you just made that up to suit your needs. Indeed, if that silly crap were true, there would be no discussion or disagreement. There being considerable discussion and disagreement by reasonable people, your claim is shown to be false. That would seem to show you to also be dishonest in making that false claim.
But really, there has been no rational or logical governmental interest put out by any source for denying a gay couples and their families the same legal protections under marriage law that straight folks receive.
The very opposite is true, with there being a state interest in more stable families, and a more secure elderly population. Those things mean fewer tax dollars spent shoring up weaker and more vulnerable members of the population.
Saying that you don't like something is not the same as saying why that thing is damaging to those involves and damaging to the country at large. And all of the arguments against same-sex marriage, no matter how verbose, convoluted, or circular, seem to revolve around that.