There is more to the story than we see
This police officer was having issues with the kids going on his property and lawn. They continued to do it.
However, on this incident, it was a girl that walked on the lawn. This officers comes at her yelling and screaming, and the one in the video asked him to respect and was not the threatening one. He didn't say 'Shoot You. He said 'I am going to sue you' if you continue acting like that. The cop was all heated and it escalated.
Granted, there is an issue there, but this got way out of hand, and he actually fired a shot, because as his dad said 'There were 15 of them, and only 1 of him'. The sad thing is that while the homeowner (cop) has a point, he will lose in court now because of this.