When a revolution comes about, don't think that the upper class won't come after the workers. When they do, it is self-defense. When workers take over the workplace, they will be attacked. Again, it is self-defense if one is forced to kill in order to achieve a better life. Self-defense means not only protecting yourself for survival, but also for making a better life for yourself and your brothers and sisters. Going around shooting random political figures won't get anything done. But when those political figures order attacks on me, or stands in the way of the masses (workers) I see it as self-defense.
"[People] act like its some kind of rock solid homogeneous body of masculine oiled men with big hammers and flat caps standing outside factory gates chewing tobacco and muttering 'those damn petit-bourgeois students and their alienating camera-smashing, I sure love me some CCTV! Don't you, comrade stakhnov?'." - Ravachol