George, welcome to the world of human weakness. What you are experiencing is not you, your shop or this industry. It is the Dark Side of Man, the Darth Vader that caused deceit, theft, and a host of other negative emotions and outcomes.
As we have shared in past trainings, the first order of hiring is to hire based on ethics, morality and personality and not on technical skills. They can be taught. Most of us are “fully formed” by the time we’re 18 and yes, we can be swayed and coerced and tempted by bad behavior, most of us will be set straight by our moral compass.
When you interview, use your instinct to get a sense of their character. Talk to past employees and even friends and parents if it’s not too awkward.
Best to you.