"Happiness is selfishness; too many people these days aren't willing to sacrifice; everyone's just about 'me me me' anymore; no one cares about the children; etc. etc. etc."
Many such zealots probably take comfort in the conviction that someday (soon very soon) Jesus is gonna come down and kick some serious behind on such irresponsible polyamorists and other perverts as you and me.
Love means never having to say, "Put down that meat cleaver!"