I believe a lot of people who go along with the small family propaganda find large families appealing subconsciously.
It is only human nature to enjoy being in the company of others especially your family. When these poor brainwashed sheeple look at these big happy families, how could they not feel deep inside them a longing for some of that happiness.
I could not think of anything worse than to have one or two children. And on the other hand I couldn't think of anything better on in this life than to be surrounded by many happy children.
"Behold the inheritance of the Lord are children: the reward, the fruit of the womb. As arrows in the hand of the mighty, so the children of them that have been shaken. Blessed is the man that hath filled the desire with them; he shall not be confounded when he shall speak to his enemies in the gate." Psalms 126 3-5
"A woman, when she is in labour, hath sorrow, because her hour is come; but when she hath brought forth the child, she remembereth no more the anguish, for joy that a man is born into the world." John 16:21
"And looketh down on the low things in heaven and in earth? Raising up the needy from the earth, and lifting up the poor out of the dunghill: That he may place him with princes, with the princes of his people. Who maketh a barren woman to dwell in a house, the joyful mother of children." Psalms 112: 6-9