What explains the radical leftist attack on the American family?
To answer this question we must understand the combatants in terms of competing ideologies. Leftism is rooted in Marxist collectivism and loyalty to the state. Conservatism is rooted in individualism and loyalty to the family. Consider the communist revolution in China. Thousands of years of venerating the family was extinguished and replaced with loyalty to the Communist Chinese Party (CCP).
Maoists instituted a national cancel-culture campaign that burned books, demolished statues, erased history, destroyed culture and cultural norms in a re-education campaign that replaced traditional Chinese culture with Maoist slogans and loyalty to the state.