More Attacks on Libya

There are reports this morning that US, French and British aircraft destroyed tank columns headed toward rebel positions.

So I can only assume that the western governments have decided that whatever type of government the rebellion ushers in will be better than Gadhafi. I'd be curious to know how they came to that conclusion.

This strikes me as a "rush to action" with little or no justification. I'm not saying it's the wrong thing to do but I'd like to understand a little better why it was determined that it was the right thing to do.