Propaganda of wrong.
The point of this film was to:
1. Make people against senseless slaughter of people look bad.
2. Make Arabs look bad.
3. Make sweet little crippled girls look bad.
The people below the embassy couldn't have hit the soldiers unless they had special volleying bullets, and the snipers didn't have a direct line of fire because of the parapet, and other obstructions on the roof. Look at this high quality drawing for reference: http://img296.imageshack.us/img296/5576/rulesengagementib4.gif. And popping out a few smoke grenades would have easily made their escape almost completely safe.
The entire film we are being played for fools. Until later in the film, we are being shown the crowd without a weapon in sight, and are expected to believe they pulled all those firearms out of their asses, and that they magically disappeared as the soldiers had a look at the mowed down crowd. We are being shown that it's okay to slaughter a large number of people in their own country, even when they're not a direct threat and it's a totally ludicrous decision that was 100% avoidable. We are being shown it's wrong to have sympathy for fallen Arabs because they're evil and deserved to die, and to doubt American soldier's actions, no matter what they caused. This film is a really bad influence.
P.S. You may wonder from the picture, well, why is the girl wearing crutches? This is a little theory I have... (Phoenix Wright moment) the girl was already crippled when they were shooting at the crowd!!! She accidentaly shot herself in the leg while she was shooting at some kittens with her favorite toy, a 9mm semi-automatic. Then evily paraded in front of the screen to make us all think the army was responsible. Errr, no, but it goes in spirit of the film, doesn't it?