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Think about it, if a criminal can't be sure that only the security guards in a bank were armed would they not move on to another target? Why do criminals not take on police stations?

I'm really sorry, but these are two really stupid statements.

1) If I'm in a bank, and it's getting robbed, I'm doing nothing but what the robbers say unless they're actively going to hurt me. They're very unlikely to hurt me if I'm doing what they say, and I'm sure as fuck not going to defend the bank's insured money (incidentally, bank robberies are practically unheard of here - and hey we don't have guns AND bank branches are NOT guarded by anybody, let alone armed guards)

2) Police stations are not robbed because how stupid would you have to be? Seriously? Besides which there's nothing to steal; certainly nothing not under a heavy vault. Risk vs reward.