I disagree. I think people are basically people. We do know that aggregation seems to breed criminality, so that's a factor. IIRC, crime rates scale with metro population on a power law with an exponent of ~1.15, meaning that for every doubling in city size you'd expect per capita crime rates to increase by ~15% on average. The Santa Fe Institute released some research briefs on this 6 or 8 years ago showing surprisingly good fit of the data (crime rates in cities vs. city size) to this trend in a number of countries. Since we first instituted police departments our biggest cities have grown by a factor of ~10, so we'd expect a tendency to criminality about 60% higher than in the past. It's not an insignificant increase, but it's also not an order of magnitude type increase. I don't think underlying human nature has changed. As I said, neurotypical humans are hardwired for prosocial behavior. Our default is to push the rules, but generally follow the spirit of the law if we perceive it to be generally regarded as a good law. Laws our social circle perceives to be "bad laws" we'll be happy to ignore, or even intentionally violate. Fortunately, most people think proscriptions on theft, rape, murder, etc. are good laws.