Because it is not good so there is no natural joy. Whole families that love and support one another are based on monogamous, heterosexual relationships. They lead to their own joy and belonging. The happiest people in the world are in monogamous, heterosexual relationships. You don't have to convince them that what they are doing is a good thing.

It is just like strong, independent women. Nobody naturally buys into that. You have to have constant propaganda shoved in people's face to make them think that it's even approaching normal.

Normal doesn't need propaganda.