Hyoe Ouchi, a leading postwar Marxist economist, personally visited the Soviet Union and the People's Republic of China—nations established through proletarian violent revolutions such as the Russian Revolution and the Chinese Civil War.

Following his tour in 1956, he remarked regarding socialism:

"I have studied socialism for a full forty years, but my progress was slow, and until now I could not clearly tell whether socialism was a utopia or a science. However, after coming here and observing various things, I have firmly come to realize that it is indeed a science." [21]

Furthermore, regarding the field of economics, he highly evaluated the Soviet planned economy and praised both Lenin and Stalin as economists, stating:

"In the second half of the 20th century, Russian economics will come to demand a fairly prominent position in the global economic community as a discipline with progressive characteristics...

The names that will gain ever greater brilliance as economists amid such historical transformations will undoubtedly be Lenin and Stalin." [21] (Wikipedia)

If students who were taught Marx's The Communist Manifesto and Capital—which preach that "proletarian violent revolution is an inevitable outcome of capitalism"—went on to commit hijacking incidents and indiscriminate acts of terrorism as part of a proletarian violent revolution, even if they were only a tiny minority rather than the entire student body, it is only natural that the teachers in question (Communist Marxist economists) should be held liable as instigators (abettors) of murder.