On Monday Rebels were fighting for Sirte. Several news agencies reported that the resistance in Sirte was by armed civilians. NATO has announced the use of close air support gunships AC 130s, weapons designed for attacking in urban warfare. Sirte has sustained air raids, was facing rebel attack and was the next town to be taken.
Ok the situation is fluid and rebels have been pushed back. Nevertheless it is reasonable to assume that Western planners are planning to reverse that situtation. If Sirte is not under siege right now, it pretty much was on monday and will be again shortly. Either way there is no doubt that Sirte has to fall for the rebellion to reach Tripoli. This will be carried out with airstrikes.
My point is how is the situation of Sirte, a town resisting being overrun by hostile forces, any different to the situation that Benghazi faced?