I think people should take a moment to reflect on the nature of law itself, as a construct of powerful people with enforcement subject to the influence of powerful people.
Consider also for a moment the claim of Osama as the world's #1 terrorist... and then read this
United States and State TerrorismWhat's the difference? All I can see is that one entity is many times more massive and slightly more abstract with much more experience, precedent, resources, and a claim to legal authority on their side.
You have government & mega business, which can manipulate the definition and enforcement of legality, who works to expand their power... and you have people on the receiving end of that... who have little... and are mostly just desperate.
The former is condemned, but the condemnation amounts to nothing. The latter is condemned, and actively eradicated and their eradication celebrated.
And yes, I know that Osama doesn't really fall under the desperate victim label, and I don't sympathize with him... but he is also a rather unique figure. I don't have a problem with his assassination. I just wish less people would openly display their bloodthirst in relation to the event.
And I really hate attempts to simplify the issue into matters of legality or black & white morality where X is wrong and should be punished by law, when there are multiple sides participating in X from vastly different contexts.