Curfews imposed in French cities as rebellion against austerity grows nationwide
(breakthroughnews.org)
Well, like, cutting defense spending would also be austerity. Increasing corporate taxes would also be austerity.
A "rebellion against austerity" only serves to paint the protesters as irrationally opposed to responsible money management, in general.
It does make a difference to communication that they are protesting against a specific kind of budget cut. A skilled propagandist would want everyone to think the protesters are making irrational demands, rather than the reasonable and specific demand to not cut education funding.