I maintain that some folks have been trying to destroy everything that they can for a long time. They used to call themselves Marxists. They used to believe that "class warfare" was a great weapon. But, nowadays, most people realize that they might get richer later -- or they might get poorer. So, class warfare will probably bite them at some point in life -- which is why most people do not approve of class warfare.
However, sexual warfare is much better. Not too many people change sides in that war (though some do). And if the minority view can triumph, it can cause serious damage to just about everything: marriage, faith, personal responsibility. All of that goes out the window if homosexuality becomes normalized.
So, the people who have been trying to destroy as much as they can (they've been at it since at least the French Revolution) are now putting all their efforts toward normalizing homosexuality.