Actually, the case law I've seen has stated cops have no duty to protect individuals, just society as a whole. For instance, the city of San Jose in Kalifornia is currently being sued by the people injured at a Trump Rally. The city tried to claim they had no duty to protect those injured by the "protesters". The federal judge over ruled them and the suit is going forward. E
Basic torts, when you undertake a task you have the duty to do so in a non-negligent manner. Don't know if it applies to this case but I should think it could. Though I doubt the facts could sustain th theory.
