let's be straight: it's all about oil.
it's true that gheddafi is a cruel dictator and it is very likely to kill everyone in his way, but tens of genocides are ongoing in this moment all over the world and nobody cares.
but libya has got oil. i think it's the biggest african oil productor.
and up until now 60% of the libyan oil was sold to italy, due to historical reasons (libya was once an italian colony, there are italian oil companies in libya) and political reasons (berlusconi is not the first italian leader to be a personal friend of gheddafi).
whe the revolt started france and england supported the rebels because they hope to get a bigger share of lybian oil in compensation. italy is in because we don't want france and england to take all of the oil, and i think USA is in because when gheddafi started winning against the rebels he said he was displeased with the western countries and maybe he should have started selling libyan oil to india, china and russia, which i don't think is in the usa's interest.