The family unit is a threat to the leftists who want government control over all aspects of our lives. Satan and his followers have targeted the family for destruction. It is a long slow strategy and is only partly complete.
If, for example, you wished to destroy a nation by stealth, let us consider how we would accomplish this. One would attempt to get the society to implode and destroy itself. You would need to weaken it’s core institutions, damage its structure, turn sectors of society on each other, destroy its ability to defend itself, cut its birthrate, and even destroy its desire to exist.