I'm not sure you can exonerate the crowd that easily. I need to find a longer video of the trucks approach to be sure of this but from the description within this post and the pictures provided it seems the crowd was very aware of the trucks approach and even cleared a path for it. I understand what you're getting at and if it happened like you think then I guess you would act in a fight or flight way. Thing is, it doesn't look like that's what happened here and the driver was released without charge, which also suggest he didn't cause any harm. I think it needs taking into consideration that some people who go to protests are looking for trouble.