As a new CEO, I assumed the employees presenting the biggest threat to my business would be the poor performers. They'd do their job poorly for a variety of reasons that are familiar to anyone who has managed people.
It turns out poor performers aren't the biggest danger. It's actually employees with ethical challenges.
To illustrate, imagine an employee who is responsible for a key business activity with a deadline. If that task isn't done correctly, your business could be at huge risk. You get alerted by that employee and are able to compensate as an organization.
Let's say the employee decides to lie to you about the task. "Everything's going fine!" they say. You eventually discover the lie but your whole business is at risk.
The old saying, "Trust but verify" holds true – especially with new people.