Numbeo is entirely based on self-reports by the kinds of people who use Numbeo. For price comparisons you can at least argue that although the prices listed are

Numbeo is entirely based on self-reports by the kinds of people who use Numbeo. For price comparisons you can at least argue that although the prices listed are much too high, it's a realistic representation of how much you're likely to pay if you're a naive Westerner who interacts with locals mainly in English and isn't particularly price-sensitive. But the crime index is entirely based on how worried people are about crime. Considering that most people won't personally become victims of a crime in a given year even in relatively high-crime areas, the crime index tells you more about the people doing the self-reporting than about the level of crime.