Although every situation has potential for wrong doing, in defense of the officers, they need to proceed in a manner that best insures their own safety. It is no easy task to bodily remove 30 of 40 adults and arrest them. There is significant chance of escalation of violence and chance of injury to an officer, should he attempt to remove these people. It takes very little resistance to cause injury to the officer. Routinely, combative individuals will be able to injure their subduers even with 5-1 odds (officer - assailant).