Correct, but studies have proven under certain circumstances that even intelligent people make bad decision. Again I am by no way condoning what was done. You get that many people together there is always going to be an agitator and many others who will blindly follow.
I have been at a football game and somebody yell after a tackle you missed the facemask when clearly there was no facemask, yet before you know it 2,000 other people in the stands are yelling you missed the facemask and booing the officials when clearly nobody saw it and it never happened!
Herd mentality, mob mentality and pack mentality, also lesser known as gang mentality, describes how people can be influenced by their peers to adopt certain behaviors on a largely emotional, rather than rational, basis. When individuals are affected by mob mentality, they may make different decisions than they would have individually.