The two professors give you the true answers:
1. The Culture Revolution established the Great Wall of nuclear weapon which will protect Chinese forever.
2. Deng Xiaoping and Liu Shaoqi attached Mao Zedong first. The Culture Revolution was the defense of Mao Zedong.
Your family bad experience should attribute to Deng Xiaoping and Liu Shaoqi.
3. More Chinese people would have been attached by foreign invaders without the Culture Revolution.