I see videos of ostensibly normal people committing opportunistic crimes. I saw a video of a kid at school, who has his knapsack open and was obviously out-of-sorts. Some guy just walked up behind him and rooted around in his bag. I see videos of people walking down the sidewalk (just some lady in a track suit) and veer off to steal a package off someone's porch. I have a naive mental model that criminals are criminals, and law-abiders are law-abiders. Criminals seek opportunities to make a buck - law-abiders do not. Seeing these videos causes me to wonder just how many otherwise perfectly law-abiding citizens are one opportunity away from a crime. I know at least one person who is a chronic abider. When I see someone's trunk open in a parking lot, I'll close it for them. Someone drops a bill, I'll give it back. A cashier undercharges me, I'll point it out. I've gone to great lengths to return someone's lost wallet to them - money intact. In a cross section of, say, 100 people (I suppose that would have to sample the whole continent), how many do you think are one opportunity away from a crime? I'm also wondering about an experiment that could test this.