Yeah, bit of a moron, guys with sledgehammers, who could easily have been armed, and even without guns could clearly hurt him. You wouldnt' do that with your daughter there. Firstly, phone the police, get them on their way, they take pictures subtley and walk away without shouting "gotcha" and drawing attention to your kid. Utterly retarded. The longer they were there, the more chance they'd have of being caught so letting them know they were being filmed was the most retarded thing he could have done on every level.
But saying that, at least it wasn't another apathetic twit who didn't want to get involved, however he got involved in the wrong way, a dangerous way and put his daughter very much in harms way.