Liberty encompasses all things as long as you don't harm or defame anyone.
Being a slaver, murderer, and/or rapist is outside the realm of liberty as they fall under the category of harming someone.
Gay marriage does not.
Am I being clear enough?
No, I don't believe in nihilism.
Gay marriage is a social issue, not a violent one. If you dislike gay marriage my suggestion is to not engage in it.