[TeMPOraL]

I can see the engineering appeal in this idea: testing beyond the expected operational envelope will tell you which parts of the process break first.

As for applicability, every now and then you hear a disturbing story of some office being raided by the police / anti-corruption force - this is not unrealistic if you're e.g. a news agency in a country whose government doesn't always respect the freedom of press.

[imwillofficial]

But having actual armed with (fake or not guns for a drill?)

Nah, too much could go wrong, security guard shoots them, somebody gets brave and jumps one of the “terrorists”, etc…