Also note that the bolshevists are tin-eared enough to do this with little or no understanding of the results.
They do understand the results.
The family is the basic building block for everything.
You remove it and people are unable to organize to resist the state.
Look at what the Inca did. When they conquered an area they gathered up all the people and scattered them through out their empire. You were placed where your neighbors were all from different areas. You had no language or customs in common so your only way of communicating was through the language of your conquerors. It prevented cohesion and without cohesion there can be no effective rebellion.