There is a myth that the police are there to defend and protect citizens. The truth is that the police CAN NOT protect you, they CAN NOT defend you. It is NOT EVEN THEIR JOB to protect and defend you. The people that the police take their orders from, sometimes will give orders to stand-down while mobs burn buildings, destroy property assault innocent bystanders.
Lastly, and most important to remember, is that the police will follow those stand-down orders while you are beaten by the mob. They are not responsible to you. They are only responsible to the people who cut their paychecks. And no, YOU DO NOT pay their salary. Money is taking from you by force (taxes) and given to them for following orders. Sometimes those orders are to stand-down.
When told to stand-down by their bosses, they will not stand up for you.
You are your first and most important line of defense. Do not forfeit this natural right to any man or institution.