You seem to ignore the possibility of a 5th group in addition to the ones you mentioned: that is: students who are reasonably well educated on this issue, who are not pro-Hamas, not anti-Semitic , not anarchist, not Communist, who know why they are there: because they are opposed to the current polices of the Netanyahu government and specifically the actions in Gaza. My strong suspicion is the this 5th group represents the majority of students who are involved in these protests.