Government and the institutions it creates take on a life of their own.
These organizations, like an organism, want to grow in budget, scope of powers, manpower, status.
You see this best in how they step on each others toes over who is responsible for what so that they can justify a budget and more senior schedule executives.
These organizations, if they even had a real mission statement to begin with (most members of these organizations never know what that is), lose their true purpose along the way.
You end up with a DOJ that no longer serves the public in promoting justice, a court system that is broke, government media which is a mere propaganda mechanism, education system which doesn’t educate well unless we’re talking about making kids into little social justice warriors, even NASA, etc...
All devolve over time into something which is simply serving itself and is disconnected from its actual purpose for existing.