Its was so weird when Gaddafi was killed. He was a murderous villain and the west had directly made sure that his regime would fall or even outright tried to kill him with bombings. But when some of his so-called subjects got their hands on him and finished the job it was much maligned in the press. For some reason the more power you have the less people feel like you should experience consequences.
By my understanding he sponsored IRA terrorists and unnecessarily attacked Egypt and Algeria in some minor conflicts and a few public executions (Lockerbie was pretty clearly a Syrian action).... That's it? I do think he claimed to be a murderous villain since that was working for assad
I could be wrong but on raw terms it's not too far off from say any given us president in the last 100 years
All the pain and suffering caused by Gaddafi happened off screen to unidentified people so we were silent. His killing happened very much on screen to a recognizable "bad guy" so suddenly we found moral outrage.
Edit: I believe the first Gulf War was justified. The second however is a war crime. IMO