Annoying But Necessary

As annoying as it may be, dissent is necessary.  It forces reevaluation, which brings about change through increased awareness.  Some say dissent, for its own sake, can be dangerous.  I wonder if there is such a thing as that, whether aimless disagreement exists.  It may seem extreme, and so threatening, but I think every act or expression has a point, even if we may not understand it.