The point is not approving the sin, but pointing out the hypocrisy of the argument. The Gentiles blaspheme God because of believers' hypocritical behavior and standards - the Gentiles don't know any better, but believers should. It is a hindrance to salvation (which Jesus Himself said to the Pharisees of their hypocrisy). This is one of those things. The hypocrisy is just as much of the problem in this debate as the issue itself.
Wanna know one reason people are not listening? Because they see right through the argument, as it portrays itself as a means of control rather a defense of morality. Why do you think Jesus harped on hypocrisy so much? It hurts your defense of morality. Preaching something you don't live yourself. Preaching sanity of marriage when you don't treat it as sacred itself. People don't like to be commanded to do something that the accuser does not himself/herself.
Wanna know one reason people are not listening? Because they see right through the argument, as it portrays itself as a means of control rather a defense of morality. Why do you think Jesus harped on hypocrisy so much? It hurts your defense of morality. Preaching something you don't live yourself. Preaching sanity of marriage when you don't treat it as sacred itself. People don't like to be commanded to do something that the accuser does not himself/herself.