He should be charged with war crimes, like more or less all US (and many other) presidents. Of course it's not gonna happen.

The fact that George Bush Junior is a free man is downright insulting

There's not much in geopolitics that isn't downright insulting. Different flags, same scumbags.

> Obama ordered an American Citizen to be assassinated via a drone attack, without a trial or anything. Should he be charged with murder?

Yes.

Comparing the idea of ordering the killing your political opponent with approving an operation with killed of someone related to an Al-Qaeda and even saying it was a mistake is weird, to say the least.

It sounds like you have no concept of the law.