And how, may I ask, would a bunch of people with AK 47s and pickup trucks prevent a tyrannical government?
You cannot control an entire country with drones, fighter jets and tanks. None of these things can stand on the street and enforce curfews, they cannot kick your door down at 4am and search your house for contraband, they cannot stop and search civilians on the street.
None of these things have the power to maintain the needed police state that a tyrannical government would try to enforce, a police state that tries to subjugate and enslave the people of a nation. Police are needed for a police state, boots on the ground are needed and civilians will always outnumber the police. Which is why... in a police state it is imperative that the police are allowed weapons and the people have nothing.
However, when every random person walking down the street could have a pistol tucked into their waistband or every homeowner is waiting behind the door with an AR-15 all of that goes out of the window because now the police face the very real possibility of bullets coming back at them.
If you want living examples see my previous post, AK47s and pickup trucks work just fine against the US gvmt.