I also agree with you. Here is the problem with that. He already viewed the tree trimmers as invading his space. What if it is the nice lady walking her dog tomorrow? Once the police know and recognize this issue, if they leave and someone gets shot, then someone gets hurt and sues the City for MILLIONS because the City was negligent and didn't do anything. Welcome to the wonderful world of litigation where the right person in the wrong spot can get rich off of a negligence claim. While some are justly appropriate, others are not.