Panic Buttons and Door Openers

I can't tell you how many times being robbed/stuck up (like a stick up in some other tense) has come up at headquarters since I began working. People always talk about how when someone comes in stores with a gun, they always try to get everybody to the back (if they don't just get the money right away from the front, because we keep not much cash in our till). My coworkers have all decided that they would never let a robber with a gun take them to the back of the store, because then they would just die where no one could see them. Cosmo is especially indignant about this idea...he always says "if someone pulled a gun on me and told me to go to the back I'd say 'uh, no, i'm not gonna do that.'" He always says it in this really soft voice that's hilarious because you would never imagine anyone talking to a robber that way.
The reason this topic came up yesterday was because Cosmo told my boss and me this story about a restaurant owner in Nashville that got locked in his freezer and died. The electricity went out in his store, so he went and got some dry ice to put in the walk-in freezer to keep all his food from going bad. Somehow while he was in the walk-in, the door locked behind him (which is really weird because I don't even know if our walk-in locks period). So...if you know anything about dry ice, you know that it is the solid form of carbon dioxide, and as it changes states (like ice would melt into water) it just becomes the gas form. So this guy probably realized he was in trouble since he was locked in a basically airtight room with a bunch of carbon dioxide. Their walk-in had a panic button in it in case of an emergency, like a robbery or something. Maybe also for a situation like the one he found himself in. So he pushed the panic button, and the police came and searched the store and didn't find anything so they left, and he eventually died of asphyxiation.
My boss and I thought it was weird that they had a panic button in their freezer. Because we surely do not. There are buttons in the back of the store in my boss's office that look like panic buttons, but I found out yesterday that all they do is open the front door. Cosmo and I had both thought at least one of them was a panic button, and my boss was like how much would that suck if we were being robbed and one of us was in the back of the store pushing that button thinking that help was on the way. Because nothing would happen. And then it came back around to 'I would never let a robber take me to the back of the store because then they would just shoot me in private.'
Does anyone else that works at a restaurant like headquarters ever have these discussions with their coworkers? And the thing is, it wasn't just yesterday, or one other time before that...it has come up multiple times. Maybe we're just really morbid, or like to talk about how brave and how much smarter than robbers we are.
Let's just say that I hope no one tries to rob the store because one of my coworkers will think they are being smart to defy a robber and stand their ground by the cash register.