If the "alternate reality" didn't already erased it, you may recall something called "Arab Spring". It's not like Gaddafi was in a stable position at the time, and even less likely he would skate the whole situation until today.
Gaddafi was "assassinated" because there was a full-on civil war and the EU and America bombed the massive convoy he had sent to crush the rebellion in Benghazi and enforced a no-fly zone otherwise Gaddafi's planes would obliterate the rebel forces and the civilians living in those cities ( which started to happen, before the EU and US moved their asses ). Speaking of "assassinations", I don't think Gaddafi's forces would punish the offenders with only a slap on the wrist. Do I need to mention the shipping containers with bullet holes in the Sun at the desert full of prisoners?
Everyone's "performance" has been bad, but why don't we talk about Syria/Russia dealings in Libya in the last ~5 years? which coincidentally have been the worse and more unstable years since the 2011 war? ( Not to mention the usual bottom feeders of doom that appear in these situations, ie. the Islamic State, Al-Qaeda and every other "entrepreneur" group funded by the bored Sheiks in the Arabian Peninsula?