Kent State in Warrior's World

[DHBirr]

There's a question -- not really important, but it's been nagging me for a while now. A reference in DWII seems to indicate that the U.S. never got into the war in Vietnam/Cambodia/Laos. Toward the end of Chapter 3 he compares the Knight Sabers' hardsuits to other local products:

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every other battlesuit that I'd seen or read about here had been a huge thing that reminded me of the old walkertanks from the French-Indochina Conflict of the 1960s

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So what I've been wondering is: what, in Warrior's World, ticked off all those students to produce the demonstrations that led to the Kent State shootings? What differing cause led to a near-identical result (including a near-identical protest song by Crosby, Stills, Nash, and Young)?
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Big Brother is watching you.  And damn, you are so bloody BORING.