Riots of the 1960s were primarily rebellions against terrible circumstances. If you were fortunate enough to grow up middle class or better (i.e. Paris Hilton) then it would be very difficult for you to understand the anger, despair and frustration of growing up black amongst inner city poverty.
Ghettos become prisons without walls, an inescapable vortex of grief. When entire communities are saturated with this frustration, then the time bomb begins to tick. The most dangerous person in any society if the one who believes they have nothing to lose.