I really don't understand the compulsion some folk feel to steal stuff and then stash it in a cupboard with all the rest. Is it exercising entitlement? Is it sticking two fingers up to the organisation? Is it proving to themselves they are edgy? I guess different folk have differing motivations but none of it chimes with me. I understand people stealing things to use, but as others have said I haven't seen anything nice enough to be tempted to consider that.
On the subject of common sense, I remember years back chatting to someone from part of the former Soviet Union who had never travelled much and had not realised that minibar items were chargeable. He asked me a lot of questions about how to know whether something is free to take/use or not, and I realised that it's not logical or consistent. Just because we have been conditioned so that it's obvious to us, doesn't make it so to all. For example in general terms you would probably say - the pen, yes; the robe, no; the bottle of water on the desk, yes; the bottle of water in the minibar, no; the tea & coffee, yes; the packet of biscuits, yes; the packet of peanuts on the shelf above the minibar, no; and so on. He kept asking me "But how do you KNOW?" and I ended up agreeing that it is often not made clear.