Lots of questions there SO, which I'll leave others to field, other than to say that it wasn't intervention in Libya per se that was wrong. Gaddafi was about to wreak terrible revenge upon the people of Benghazi, and it was the humanitarian response to that (called for inter alia by the Arab League) that led to the intervention. As to threats to the UK, Gaddafi was instrumental in acting as quartermaster to the IRA bombing campaign.
What was wrong of course was the lack of planning for, and dealing with, the aftermath of his removal. A lesson still to be learned perhaps...