While not the only reason, one reason that my coworkers won't steal my wallet if I leave it somewhere is that the $20 is mostly irrelevant to them given the general level of prosperity at my office.
Good thing I never said that!
> Oh, and the only solution is more welfare
Nor that!
I said that for many people crime is a rational approach to more prosperity. That doesn't mean folks are near starvation and have no other choices, it just means that criminal options may be more appealing than other ones. If you create accessible, non criminal pathways to prosperity, crime decreases..if you remove them, it goes up.