I am only suggesting you to quit if you have problem hearing opinions, which here you have to hear. And this is a good thing.
Just today I am reading a detailed paper on Peng Dehuai, who criticized Mao's policies in the Great Leap Forward in a personal letter to Mao, and was first purged, and then later persecuted for it.
Perhaps if China had rule of law, and tolerance then, Cultural Revolution could have been avoided, and China could have been 10 years ahead in its economic and developmental journey.