While full length documentaries and walls of text are fine ways to convey information, sometimes there are songs that express similar sentiments in much shorter periods of time -- and they may also allow for more head-bobbing and finger tapping, which seems like a positive addition to me.
The first auditory (and perhaps philosophical) assault I'd like to put forth is Propagandhi's "The State Lottery." Released in 1996 on their ironically titled album Less Talk, More Rock (released on Fat Wreck Chords), "The State Lottery" offers succinct insight into the sort of anger that fuels movements that call for radical change.