Taking everything into account, Doctor Li mocked Mao in the book; he chastised him for intolerance towards independent legal advisers, for his attack on individual livelihoods, and for the corruption and hypocrisies of Mao's inner circle. Dr Li said: “All of China wore Mao's buttons and carried his little red book and recited his quotes and even the simplest transaction in a shop had to include a recitation of Mao's words.” Chairman Mao Thought was not just the country's guiding ideology, it was its collective mantra. Mao's Great Leap Forward had also caused the worst famine in human history; we know that about 25 or 30 million people died, a conservative estimate. At this point, Mao's role has become the greatest evil in modern Chinese history