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Why did Sima Nan get his shoes thrown at him when he gave a speech at Hainan University?

Sima Nanhai had his shoe thrown at him during his speech, which seemed very enjoyable. I want to show respect to the classmate who threw the shoe, not for his sake, but for his speech. The reason why Sima Nan's lectures are always correct is that he hides behind politics and has politics as a shield for him. If someone refutes him, he may end up being harmed. Why would the university invite such a person to give lectures?