Self-harm as protest?
Lately I've been reading the news about how a student in Tunisia set himself on fire, and that led to the wave of protests that eventually led to the ousting of the Tunisian President.
Between this, other self-immolation protests in South Vietnam in the 60's, hunger strikes in Guantanamo and Martin Luther King in the 60's and Gandhi in the 30's, and other such acts of harming oneself to make a political point, what I want to know is how exactly does this work? In other words, how can harming yourself advance your cause?