Problem with the idea of heads rolling is that it doesn't really achieve anything. Let's hypothetically say you just stormed the parliament and slaughtered all

Problem with the idea of heads rolling is that it doesn't really achieve anything. Let's hypothetically say you just stormed the parliament and slaughtered all the members there. Then what? Install military junta? That requires actual military backing, and doesn't exactly have great track record. Hold new elections? Attacking democratic institution seems unlikely strategy for winning seats, and if you think you can win that way then why did you need violence in the first place?