If I owned a jewelry store or sold things like cell phones I most certainly would have a gun handy at all times. I also would have a small inner lobby equipped with a metal detector and would only let one or two customers in at a time. Their insurance costs have to be totally through the roof.
I would build a tastefully concealed corridor leading into the store that had remote controlled locking doors, power closing assisted as well, and it would be bulletproof, robbers either coming or going will caught in this corridor and then taken away like a vermin rat in a trap.
I saw the video, the SOBs were indeed a bunch of thuggerist punks. The had yellow all over their backsides and now between their legs.