technically I do not believe he is head of state anymore...so far was we are concerned...As the US has recognized the rebels as the leadership of the nation...also he has stated that he is not ( of course it was his mindless ranting ) and thus there could be a legal argument that he is a just a Col, wanted for war crimes then.
Sounds to me as if we are involved in an internal civil war, with no national interest at stake...why again are we involved?
And in the broad sense the US resolution says to protect the civilians...one could argue that the only way to really do so, is kill him..thats being fairly liberal with the terms of course...
That is quite a stretch, and under such interpretation you could use a nuclear weapon to "protect civilians."
though I suspect NATO will be happy if its a accident and try to let the rebels do it if they wish and he does not back down. Also I suspect his ego and self preservation skills will have him in some other nation in exile before that would happen.
Most likely (barring some changes) the mission will go nowhere, and Libya will sit in a state of civil war for years to come...and for what?