Okay. Let’s imagine this at a trial, since this thread is about due process.
Prosecutor: “Ms. Proudmoore, what evidence can you present that these guards, who let us remind the jury, were your own citizens, were “not innocent,” as you put it?”
Jaina: “Well, none specifically, but they were with Aethas and I strongly suspected…”
Prosecutor: “So it is accurate to say, isn’t it, that you had no specific evidence that these guards were guilty of anything, except of doing their job and guarding Aethas Sunreaver?”
Jaina: “Well, not as such…”
Prosecutor: “When you unexpectedly teleported into the room, how did these guards react?”
Jaina: “They raised their staffs and adopted a hostile posture!”
Prosecutor: “So the trained guards, when confronted by an angry, unannounced intruder who had magically teleported into the room to confront the man they were charged with guarding, raised their staves and adopted an aggressive posture towards you? Did they do anything else? Did they actually attack you, or attempt to cast a spell before you attacked and killed two of them?”
Jaina: “Well, no…”
Prosecutor: “And after you killed those two, how did the other three react? Did they attack you then, or while you threatened Aethas?”
Jaina: “No.”
Prosecutor: “And you are a very powerful mage, some would say one of the most powerful on Azeroth. Did these guards ever pose a realistic threat to you?”
Jaina: [scoffs] “No.”
Prosecutor: “You teleported Aethas to the Violet Hold for further questioning, but then you proceeded to kill the remaining guards. Could you not have teleported all the guards, also? Weren’t you later seen effortlessly teleporting many people to the Violet Hold?”
Jaina: “…”
Prosecutor: “And just to clarify, throughout this entire encounter, was any attack, however futile, made against you?”
Jaina: “No.”
Yeah, if there was due process and people weren’t above the law in this world? Jaina would be going away for a long time.