I have a very clear idea of what security guards do and I don't know where you got that I believe they "sit in front of the entrance all night" (which they do v

I have a very clear idea of what security guards do and I don't know where you got that I believe they "sit in front of the entrance all night" (which they do very often in South America, by the way, among other locations). Any "reasonable robber", which means maybe not your early teen looking for some adrenaline or the out-of-their-mind tweakers, knows or checks whether there are any security guards in a building in which they intend to make a robbery.