If you watch the video to the end, you see how it escalates from shoplifting to violence when the thief doesn't get his way - essentially he doesn't know the word "respect" beyond "I demand you respect me", even in the midst of a robbery.

Having seen similar shoplifting incidents around SF, I feel bad for the security guards. They're not allowed to physically stop thieves at larger chains, but they're expected to follow and hinder them. It's a very tough job, ad prone to injury.

It's fascinating to watch the change in behavior when the "security guard" flashes his SF Police badge and says, "Actually, I'm a real cop." Then the thief drops everything, stops mouthing off, and heads for the door..