Xiao Zhou is 26 this year, practically a young middle-aged man.
He works in a factory, doesn't earn much, has little time to spare, and is a true blue-collar worker—almost what you'd call a poor member of the middle class.
With such a background, Liu Wenkai is all too familiar—people who like to commit a certain type of crime almost always share a similar background. It's not that people of other backgrounds don't commit such crimes, but proportionally speaking, there's always a demographic that is in the majority.
To describe this phenomenon with a fancy term, you could call it "big data demographic profiling," or even "FBI-style criminal profiling."
