ViktiThis is a good question, and I just happen to be reading 'The Conquest of Gaul' by Julius Caesar.
Was the assassination of Julius Caesar justified? With the benefit of hindsight, I'd have to say yes. Although it provoked a time of internal conflict, I believe the republic was doomed and Augustus made a far better emporer than Caesar ever would have.
Is assassination ever justified?By what criteria? Morals are relative to culture and circumstance. If a dictator or other leader is known to be a credible threat to his state then I'd say yes, even if it was illegal then assassination would be justified if it prevented a greater evil from being comitted.
I'm not quite so sanguine with respects to assassinating other people though. It seems to me that the argument can just as easily be made that assassinating a minor politician, or even just a common man in order to prevent a greater evil from being carried out is justified but in such cases I'd say that the threat posed by such non leaders can never be so great as to warrant murder.
If I had a time machine I might go back in time and assassinate Adolf Hitler, but if I did, then would it be justified? once Hitler was dead then he would have died an innocent man and I would be a murderer and I would have removed my own justification for assassinating him.
Perhaps Vonnegut was right. People die and are killed. So it goes.
Its left for the individual to decide whether or not they feel justified in assassinating a leader. Then the rest of us can decide if we feel justified in punishing the assassin.