Exactly! Traditional marriage is equally available to heterosexuals and homosexuals. Homosexuals (most anyway) freely choose not to enter into it, to pursue a different lifestyle that precludes marriage.
I think debunking the “civil rights issue” lie is key to winning people over. Most Americans are very passionate about civil rights (as they should be) and the homosexulists know this and use it to manipulate people.
One of the gravest difficulties of this entire scenario is the person who indulges in gay behavior, but gets married to a person of the opposite sex anyway and has children. When society upholds a single standard for marriage, many children get caught up in this disgrace and sham. Unfortunately, the liberal "no-fault" society does not see this kind of betrayal of vows as a crime, since a commitment of great value is wasted by the double-dealing spouse; but the logical protection for children is to prosecute for adultery as we did in the past, or at least deny custody.
But nooooooo.