This is a no fly zone, not a full scale war. The German military, the largest in Europe, is prepared enough to help us in Afghanistan, so they are prepared enough to enforce a no fly zone, but hey are not in NATO nor do they want to get involved on their own. I'd say the British has enough fighting force to enforce a no fly zone by themselves. They involved themselves in Iraq and we are in NATO, so if we can do it, I don't see why they can't...
He invaded Iraq. You can compare and speculate on their motives, but also be mindful of the obvious differences.
The facts are, Gaddafi had more power than the rebels and the rebels were losing, and he was willing to kill them all. Now we can speculate that the rebels knew all this when they decided to rise up against Gadaffi and his military. We can also speculate that they were counting on outside force to give them an upper hand.
I think that that is a good speculation.
They even knew what they wanted NATO to do.
But still, Libya is different. It isn't like Iraq. It's not even like Iran. When the Iranians were protesting after the elections, some people thought America should do something and get involved. America didn't get involved. Iran was actively trying to overthrow their government... they were rioting, but it wasn't a full blown revolutionary war.
The situation in Libya isn't a simple revolutionary war either, because the leader was attacking and murdering people. Gaddafi's murderous actions is what likely caused the protests to escalate into a full blown rebellion.
NATO decided to get involved on the legal grounds that Gaddafi was committing international crimes. NATO is protecting the civilians, but NATO is also helping to overthrow Gaddafi by enforcing the no fly zone. It could be very likely that NATO is more interested in killing Gadaffi than saving civilians. I wouldn't doubt it, but at the same time, they have legitimate reasons to enforce a no fly zone. It's not like NATO is breaking international law.
We have seen presidents issue bombing campaigns for less cause than this.