They did in one form or another. The SJW is a radical engineered to serve an old agenda. You just need to learn the history they were disincentivized to teach you.
You would think that they're sworn enemies from the way story is told in school, but the Marxist vision of a centrally planned economic, social, and political order was not at all incompatible with elite plans for world government. It just needed some case-specific alterations.
The international banking cartels and industrial "robber-barons" of 19th and early 20th centuries that had amassed great fortunes (especially during wartime) often found their plans for the reorganization and modernization of society (on their terms) frustrated by the same "oppressive" monarchies, aristocracies, religions, nationalisms, tribalisms, and traditions that Marxism promised to overturn. By financing Marxism, global elites could both co-opt its message and steer its ultimate direction, thereby covertly recruiting their seeming opposition as a powerful new ally in their schemes. Controlled opposition is, after all, the best kind.
Thus, in globalists' home countries, the Marxist victim-oppressor dialectic was reoriented from the axis of economic class to axes of biological identity (i.e. race, gender, and sexual orientation), securing much-needed cover for financial elites and their supra-national "non-governing" bodies by diverting leftist academic scrutiny from overt economic inequalities to natural ones. It also had the effect of agitating and exacerbating those same divisions among the citizenry, rendering them incapable of unifying around a coherent political platform. Divide and rule.
The global elite understood that the way to sell slavery to a Western, capitalist democracy was to brand it as a form of liberation. This necessitated a revolution in education that would dispense with individual virtues, traditional values, and objective truth. Instead they would institute an ersatz system founded upon a moral and intellectual relativism that stressed socialization, consensus, and collectivism. The subsequent leftward slide of the masses effectively arrested the development of any ethno-nationalist movements which pose perhaps the only serious ideological challenge to globalist rule.
Thus, for the past century or more, our schools and universities have been socially re-engineered by a professional cabal of progressive educators, utopian crusaders, marxist agitators, leftist academics, communist zealots, and other so-called "school reformers" and "change agents" laboring under the generous patronage of such esteemed names as Ford, Carnegie, and Rockefeller (through their tax-exempt foundations, of course) to, often by their own admissions, produce a collectivist, obedient, and technocratically manageable society of credulous, helpless imbeciles incapable of independent thought and political agency.
To understand how all this came about, it is necessary to study the genesis and history of our educational system outside the narrative parameters of that same educational system.
References:
http://en.wikipedia.org/wiki/General_Education_Board#Philosophy
http://www.americanthinker.com/articles/2014/07/the_k12_conspiracy.html
http://www.americanthinker.com/articles/2012/10/john_dewey_is_a_fraud.html
https://archive.org/details/JohnTaylorGattoTheUndergroundHistoryOfAmericanEducationBook
http://www.americanthinker.com/articles/2012/05/never_call_socialism_by_its_right_name.html
David Rockefeller's resume scrubbed from Wikipedia for being "too much info"
http://www.wanttoknow.info/articles/tragedy_hope_banking_money_history
https://www.youtube.com/watch?v=Sah_Xni-gtg (berk 1, berk 2)
http://www.schillerinstitute.org/fid_91-96/921_frankfurt.html
Somewhat off-topic but fascinating source material
The Order of Death - Anthony Sutton explains the Skull & Bones Secret Society
COVER UP: Behind the Iran Contra Affair
Bill Moyers - The Secret Government
The Last CIA Whistleblower: Drug Trafficking, Training Terrorists, and the U.S. Government