One of the most basic rules of firearms safety is to never point a gun at anything you don’t intend to shoot. The use of a firearm is a serious business and should be reserved for those potentially life or death situations. A sheriff used her duty firearm to threaten her son to behave, on a school bus. This is a very dangerous abuse of power and a very serious mis-handling of a firearm. Don't do anything you would arrest other people for doing.
I would question this person’s ability to make reasonable use of force decisions to the point were I would be reluctant to have them continue their employment as a sheriff. The use of a gun to threaten children is especially egregious. This is one of the reasons to have a psychological evaluation and drug testing for employees of police agencies.
As an officer we are given great power by the state. We are allowed to detain people and deprive them of their right to move around freely. We can search their persons and belongings, we can even use force against them, including deadly force. As a result we must be held to a high standard of behavior or risk losing our position; that’s the view from the Hysterical Right Wing.