Is there any reason Strong Families are incompatible with alternative lifestyles? The modern conception of the nuclear family as the main unit is itself something barely 50-100 years of vintage. What's the in practice difference between say, a polyamorous group raising children together in a stable situation and a large, extended family with various cousins and so on?

Or to make it even simpler, I see no strong reason to say "you shouldn't be gay" when you could be saying "Hey gay guys, you should form a monogamous pairbond and raise children together for 18 years".