This protocol in a terrorist gunman situation is the product of people who don't trust you and believe that only they can solve a problem. The advice is so bad that the video produced by security 'experts' shows victims cowering in a cupboard as the police kick the door in. Police response is so slow that the chances are much higher that a terrorist will kick the door in and inflict certain, and possibly painful and humiliating, death. Hiding and waiting for police with guns to show up only increases your peril as in all forms of warfare blue-on-blue is a very real danger. The only useful advice is to not play dead.
Another destructive aspect is that terrorists now know how their victims have been trained and how they will behave. In a desperate effort to reassure weak and helpless people the government has given them what they want and the terrorists valuable information in formulating a battle plan in the process. A well coordinated cell could easily shepherd victims like startled pheasants onto waiting guns.
Finally, the protocol advertises weakness and surrender and can only encourage further bolder attacks.
Becoming a suicide hostage is a superior tactic in a terror situation and a superior strategy to live life without fear - the chief weapon of terrorists and governments around the world.
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