"You say, 'Away with you Communists.' We say, 'Away with you imperialists.' Sometimes we say things like that. It would not do not to do that." That was Mao Zedong speaking to Henry Kissinger in 1973. The candid and sweeping admission by Mao, who in President Xi Jinping now has a successor of equal ambition, has critical relevance 46 years later.