It should be someone's choice if they prefer to marry the same sex as them why stop it? Most of the world has learned with 8 billion+ people we really don't need to reproduce anymore as much as we use to when the population was less than a billion. Nowadays we also have had technology advances which only make it easier to reproduce even if you're gay.
Then why dont you spread same sex love where all the reproduction is done these days? Like Africa and middle East... oh, wait. I forgot, they would kick you so hard in the ass, that you would search for it in the google maps.

Why the fuck should we amend family structure of entire society for a minority, that is completely fine as it is and consists of maybe 5% of all people?
Why? Who does it serve? Guilty conscience of liberals?
There was a time when a white man would say "Why amend the laws and set slaves free? It is completely fine as it is." But once you put yourself in the shoes of a slave, who never chose to be born a slave, then it isn't completely fine.
So as a homophobic and intolerant person towards gay people, of course it is completely fine to keep old traditions. Being gay or straight isn't a choice, so maybe put yourself in the shoes of a gay person. What are your options? Pretend to be straight to appease people that hate you, or have less rights?
One could ask who it serves to prohibit gay marriage? Does it only serve intolerant people? Who wants to serve them? lol