actively committing a crime ("stealing cars") v. passively committing a crime (failing to do something or looking the other way)
Also ignoring intent, People don't unintentionally steal a car. People can unintentionally fill out a form or misunderstand or be unaware of the requirements of the law.
Additionally, theft is ingrained into the fabric of society and religion. Following some sort of government reporting requirement is not included in any religious teaching that I am aware of.
I am talking instead about a situation where an employee knows the organization is corrupt, and then knowingly and actively participates in some of those criminal actions. You can't deliver vouchers you know to be fraudulent. If you do, you are and should be criminally liable. Large-scale organized fraud depends in part on the willingness of every cog in the organization to perpetuate the criminal enterprise.
At least as reported, petty theft seems quite rare; poor people qualify for food stamps, food banks, etc., or just beg/panhandle for money, so there aren't many cases. This profile of them suggests most shoplifters do it more for the thrill than any kind of necessity: http://www.shopliftingprevention.org/what-we-do/learning-res...