All business owners should’ve learned the lesson taught by the Korean business owners during the Rodney King riots. Standing out in front of your store with a shotgun is the only way to protect your property. The cops are not going to do it.
How about waiting inside your store with your weapon? Not exposed to fire, and when someone breaks in & you waste him, well....
You could be charged with hunting over a baited field.
;^)
On the roof with 3 or 4 buddies (for perimeter security) and AK47s with high capacity mags is even MORE effective.