So, the cult personae are not responsible for the followers?
Pirkei Avos mentions differences between students of Avraham and Bilaam, from which you learn that you can see whether the teacher was kosher by the students. And Marx was no tzadik to begin with. He, apparently, came to his hate of business owners via hate of Jews, whom he considered guilty of propagating business values. He argued with some reverend suggesting that instead of emancipating Jews, we should emancipate world from the Jews.