Most people who attack families like the Duggars do it from a position of envy, the envy the family unity and the envy the family success.
Most all the attacks from the left on families like the Duggars come from people who hate them for “some reason” they cannot conciously realize, but deep down there is a subconcious envy against people or groups of people who seem happier or more sucessful than themselves.
It is also one fo the reasons that anti-semitism is onthe rise. Instead of people looking at other cultures or groups of people and realizing what they are doing right and learnign from that and incorporating those positive attributes intot heir own culture, they would rather blame the successful for their own woes.