The Libyans were proud and happy with Khaddaffi for quite a long time.
Yes, and Baltic people lived happily under USSR occupation.
The Libyans can wave goodbye to the control of their oil now.
Libyans never had control in the first place - oil was under Gaddafi's control.
Just like natural resources of USSR was not USSR people's property, but were exploited by communist elite building useless shit like nuclear weapons.
If they suddenly change their mind it's nobody's business but theirs
They did not suddenly changed - they used opportunity when such things happened in whole region and neighbouring dictatorships could not help them, because they had problems of their own.
Just like Warsaw pact countries overthrew their communist governments when they saw that there will not be backing from USSR anymore.
Latvians did not suddenly decide to leave USSR for example - you might not know this, but armed resistance against Soviet occupation happened till 1956 - more than 16 years.
And who will set up a new government there now?
Well I hope that people of Libya will do it, not some bloodthirsty dictator anymore.