Mad Max Fury Road. They defeat the tyrant, and get the control of the water valves. Then they open the valves and seemingly keep them open. One problem, how long is the water reservoir gonna last now?
Logan’s Run. The city dwellers are freed from the computer’s iron-fisted rule, and Carrousel. But their city is in ruins, and thinks to the computer providing everything. They don’t know how to live without it. The city dwellers are going to start dying off real fast.
A lot if not all of the teen movies with rebellions against “the system” (Hunger Games, Maze Runner etc.) suffer from both the problem mentioned in the OP: The societies will suffer a lot/break apart until the newly gained freedom can be enjoyed. The system provided a structure that was “safe”, but the alternative to the system is never clear. It’s even questionable if the new structure (whatever it may be) will be any better. Do the rebels really have a better set of values that may be shared by a large chunk of the population if the old system gets removed?
I probably overthink this, but in real life we see plenty of examples of worse outcomes after a rebellion. Or rebellions failing because most of the population will be worse off (initially) and thus doesn’t share the same values/spirit as the followers of the rebellion.