Emptying of Libya's 'black' cities

I think it is absolutely disgusting how black cities in Libya like Tawergha are being emptied out by the rebels and US airstrikes. One thing that I have noticed is that in all the videos I have seen where the rebels are 'liberating' a city, there seems to already be no one there! How are we protecting the civilians if most people have fled in fear? The Wall Street Journal even reported a rebel commander saying that the people in Tawergha should just pack up their things and go because it won't exist anymore after the rebels arrive.