In small communities (think, hundreds), thievery is much, much harder. People just "know" who the thieving-types are, or can find out pretty quick by gossip. And what would they do, build a house with the saw they stole? Sell it ... back to me?
If I knew everyone I could possibly see sneaking around my house, it's pretty simple to go talk to their parents/ siblings / spouse to get them straightened out. If I didn't know, it doesn't take long to gossip my way into likely suspects.
It's another responsibility we offloaded to the state, and it is now impossible to recognize people on the street, and so there's an infinite set of people each thief could exploit. This isn't bad per se (see witch hunts and mob rule), it's just a modern exploit.
If I knew everyone I could possibly see sneaking around my house, it's pretty simple to go talk to their parents/ siblings / spouse to get them straightened out. If I didn't know, it doesn't take long to gossip my way into likely suspects.
It's another responsibility we offloaded to the state, and it is now impossible to recognize people on the street, and so there's an infinite set of people each thief could exploit. This isn't bad per se (see witch hunts and mob rule), it's just a modern exploit.