"Both" sides? If you suggest Marxism is one side, what is the other? Also, it's hard to take such a vague comment at face value when you consider the long list of Marx's influences. For example, there are right and young Hegelians...

I do think there is too much politicization in education, but this also stuck out to me. Marx was a synthesis of Hegel with Adam Smith (And a lot of Ricardo) You absolutely have many people taking those same ideas and going right. Even Das Kapital isn't really "Left Wing" per se as it is more trying to explain how labor is treated in an industrialized economies, its the communist manifesto where Marx takes those ideas and starts synthesizing with Hegel and making ideas of what should happen.