The main threat most Americans deal with is when the authorities intentionally turn a blind eye towards disruptive rioting and crime, and let it run uninterrupted, releasing violent people, not dispatching troops immediately to protect businesses from riots (as we saw in the BLM riots), etc. That's a form of tyranny too, letting your people be unprotected from crime and chaos.
People whose property is being overrun by rioters or other chaos and the state doesn't intervene to shut it down immediately with lethal force must be allowed to have weapons to take care of it themselves.