I agree that you have to keep the fire department back until after the threat posed by the Move people inside the house was eliminated . But even after the whole Move house was engulfed in flames and no one still inside could possibly be alive, they were still keeping the fire department back!

As for the bomb, I really don't know too many technical details. I just know that they droped it from a helicopter and when it hit the roof, it went boom. It didn't create too big an explosion. As I recall I think there was a canister on the roof with flammable material inside and when the bomb hit the roof, it caught fire.

I think the main mistake was not doing somthing about Move before they turned their house into a fortified bunker.