Another way to say it is that every movement needs a carrot, a stick, and an ultimatum. The carrot is evangelizing the injustice (MLK), the stick is direct action (Malcolm X), and the ultimatum is an implicit show of force and dedication that demonstrates how many people will resort to the stick if the carrot is not accepted (the mach on Washington).

While I am nearly always in the peaceful outreach camp, I strongly suspect that my efforts will not see fruition until breathless WSJ editorials start describing environmentalists as "dangerous" and "unamerican."