I think you're right. I think volume of exposure is a factor too though. If I walk past your backyard once, it is effortless for me to ignore the opportunity

I think you're right. I think volume of exposure is a factor too though. If I walk past your backyard once, it is effortless for me to ignore the opportunity to gain firewood in the name of conscience. If I walk past it all the time though, and I - don't have other ties to you (like knowing you or living in the same neighborhood) - am not at risk of getting caught (you're blind and deaf for example, and there are no neighbors to see) - need firewood it's not obvious to me that I won't steal. There are probably a lot more checks in place that are involved that don't come to mind, but having shoppers rely on themselves simply make theft more likely I think.