It's a competition. You should be able to boo. It gets the team fired up.
The attempted murder charge is farcical because the Americans have already said David has never fired a shot at any coalition forces or civilians.
Allegedly, after the rescue squad found the little girl, one of the squad members fired a shot from a small caliber handgun. We don't know whether the bear was hit or not. There was no blood, but it chased it off.