I wouldn't say people in the west are "better people in their hearts" but they absolutely follow more strict norms regarding honesty and theft. This is one of the main reasons why companies pay a premium for workers in the west when they could hire from other places.
One example: accounting scandals in the US are rare. I don't think anyone trusts accounting figures for public companies from India or china.
> in which case I'd like to see some evidence.
The alternative to trust is enforcement. The evidence you are looking for is the prevalence of the latter principle in systems that deal with things of value.