Well to do this they would need to keep those state of misery somehow - by use of police or something other that could be targeted,blamed for all and physically eliminated. Otherwise people will recreate order and will start looking for their bunkers to kill them all.

It is natural that even under socialism in Cuba and Venezuela people organize themselves. The only thing that keeps their society in misery is apparatus of repression.

When people will stay disoriented they will follow any people giving solutions. And final solution of the question of tyrants and their families would be most natural to postulate - you don't need "big brain" to make such idea popular.

So sorry, at longer scale those idiotic fear-mongering scenario is impossible. We will just start killing cops and their military if they will do this. Maybe at the beginning with sticks,but question of time will be making more powerful weapons.

We would form new governments.And we would ultimately hunt them down,no rat hiding in bunker will stay alive within such scenario.

But unfortunately you are just stupid doomer. They are too smart to do this such way which would lead so easily to their demise - unfortunately...