By avoiding unwanted employees, an employer might design a carefully drawn employment ad. This ad would avoid any characteristics protected by the discrimination law. Prevention is the key to allow for any unwanted court appearances. Another thought a employer might consider, is to think before acting. Many different people have different views, but concentrating on the quality and work performance allows for any confusion.
Performance is what the employer needs to focus on by thinking on behalf of the company.
This is a protection in itself. Making an employee feel comfortable within the company is another way of avoiding diversity. If the employee feels good about the company, they will be less likely to find some fault in the company. In this approach, a supervisor is gaining allies not enemies. If a employer is willing to be a friend, it prevents any problems along the way.