I have CCTV, security tagging system, staff on guard, big stick in corner in plain view; not once have these deterrent factors stopped attempting thieves from trying to take it out.
Fear of God? What they can get away with is their right according to them!
I am now taking possessions/money off any thief I catch as compensation as the police are not interested unless more then £200-00 in goods are stolen. I asked one man to pay for the goods he had tried to steal and charged him the £20-00 he handed over for the £4-00 goods, the look on his face was priceless!
Most shops have managers who will not stop any criminal act as told by the owners, not worth the risk to health/knife crime. I feed my family and pay staff with the goods I sell so, as you may have already guessed, they are in for a surprise when I catch them.