system
Given the following post, respond as if you're commenting on Reddit:
human
[Attack on titan] (Spoilers) Why did the Military Police...

 

All right, why did the internal military police try to stop the technological development?

They executed a couple for trying to escape the walls, and having developed a hot air balloon. They also killed a subject who tried to develop a revolver.

Although, this explains why humanity within the walls could not develop further than EDM3D. I still do not understand why the internal military police tried to stop technological development. It was supposed to keep the peace within the walls, but how is this supposed to keep the peace within the walls?
gpt
More technology gives more power to the people. If guns and manufacturing are allowed to reach a certain point, then it becomes inevitable that the King will be overthrown by either a military coup or a revolution of the people.

Advanced weapons have to remain in the hands of a small, loyal class of elites (in this case the Military Police's black ops unit led by Kenny) in order to maintain a monopoly on power.