Why not just walk into the bank in the day time, go behind the counter and just take the money.
I mean.. its illegal.. and in theory you can just walk right in during day hours...not every bank has a guard. why put it there if they dont expect us to take it right?
its a silly argument. we have laws so people can respect them, not every law is designed directly with a safeguard against people who want to break it. the one in place is somewhat effective for most people.. and its called "legal ramifications" - ie jail, fines, etc.

My point is that this type of attack, like listening on a cell phone, can be done in a manner that makes it hard to catch the attacker. Robbing a bank is a physical assault where making a getaway isn't always that easy. [And on top of that, bank robberies are not that uncommon.]