Or mass hysteria or dynamics of the mass. We had enough of that when a politician got murdered here... I think our country never got the same after that.
Very true -- and mass hysteria and dynamics of the masses are usual powered by the fear of chaos. Oh, and perhaps embarrassment or guilt, I suppose (which is the reason many soldiers went to war during the Vietnam draft even if they disagreed with it). But, I suppose it also could be seen as the fear of what others would think of them if they didn't "do their duty" (especially authority figures, such as parents, or their own conscience/superego).