I agree that most people will not steal. That's been my experience of growing up in a country with rampant poverty and inequality (and crime).

That said, the more people are in need, the more incentive for them to look for solutions outside of a system that has inherently failed them and the people they know.

I have myself been robbed and assaulted multiple times. I have had relatives kidnapped. Cars stolen leaving or entering their own garage, sometimes in nice areas of the city. I have been myself held at gunpoint by both criminals and police. The house I grew up in has been burglarised multiple times. I have not once, and don't know a single person who has been assaulted or robbed by a middle or upper class person.

There is probably also some correlation between white collar crime and corruption, and poverty, but I suspect the direction of causality goes the other way around in this case.