Skylane,

As Mojo said, you will always have "That Guy" or two in every aspect of business. What happens is that management has to bring it down to the lowest common denominator.
Ever revoke a "fun time/privlege" from your kids for the actions of one of them? Same mentality.

If you found a person stealing your money, would you continue to leave it out there for the theft?
Confucius say...."Fool me once-shame on you; fool me twice-shame on me"

Many people can be trusted with others money, some others can't.