Tribal
NPR reports a "study" by some idiot sociologist. The idiot sociologist took his car through lots of full-service carwashes, leaving lots of money in the car. Sometimes he placed a girlie mag and beer cans in the car, sometimes not. When the girlie mag and beer were present, more money was stolen.
The original idiot sociologist, NPR's idiot discussers, and most of the commenters, get it bizarrely and weirdly wrong, invoking all sorts of abstract incomprehensible lunatic schizy word-salad with precisely zero connection to human nature.
Exactly one commenter gets it exactly right. It's tribal. If you show signs of drinking and driving, you're not likely to snitch on another law-breaker.