First the police being there in time to protect you is very , very unlikely. Second as ruled by the Supreme Court the police are Not legally obligated to protect you . It may be part of police department policy but it is not a law . And they can NOT be prosecuted by any court for failure to do so . It’s been tried and failed . 99.9999% of the time the only people guaranteed to be at the location of an attack is the attacker/s and the victim/s . The only person that can protect you from an attack is you. Do the math.