Can my boss fire me for allowing Adrian Peterson to use the bathroom?

See the story at:

https://www.huffingtonpost.com/2011/01/14/adrian-peterson-mcdonalds

Well, yes. There’s nothing about this situation that triggers any laws prohibiting discharge, such as discrimination, retaliation, whistleblower protections, etc. Letting someone into the restaurant at 3 AM probably violated company policy, and is thus legitimate grounds for termination. In this case, McDonald’s reinstated the employee after the media got a hold of the story.

The real question is, why was Adrian Peterson at McDonald’s at 3 AM?