My guess is the OP is talking about shoplifting.
But yeah, stealing from individuals is a different thing. Like herbavore said, you never know what something means to someone. I was on vacation once at the beach, and I spent time all week collecting tiny bits of coral and shell that were really pretty. I was going to make a necklace for my then-girlfriend with it. But then one of the cleaning staff took them. Really bummed me out, even though I didn't spend any money on them. I did spend a lot of time and they meant something to me. And imagine if you had, say, a pocket knife that was all you had left of your grandpa, or something, and someone stole it. That could/would be devastating even though maybe it's not worth anything monetarily.