I'll add that it's also possible for the police, security guards, et al to go too far.  And that's where training and judgment come into play.  Sometimes they get it wrong.  Do occasional high school bullies "graduate" to become police officers?  Sure they do.  And if they mess up in the line of duty, then they can run the risk of getting caught out.  It happens.

Police officers tend to die young.  Even when it's from natural causes.  They have a job loaded with the type of daily stress that most of us can't even imagine, or wouldn't care to imagine.  Police work is a dirty, unpleasant job in many ways.  But somebody's gotta do it.  We owe them far more thanks than they typically get from us.

Something To Do At 3:00AM