Iraq seems even worse. They admitted they invaded it on false grounds and the supposed WMDs haven't been found to this day. And it was just the beginning, because the invasion created an even greater evil, ISIS.
As for Libya, it's true that many people hated Kadafi and he was a cruel man (just like Hussein, Bin Laden and the rest of the crew), but the final result for ordinary people was a disaster. So whenever someone proposes "let's kill a dictator and al problems will disappear" for me such a person is a lunatic.