What I meant by that is that there is definitely room for improvement and therefore a stance of “we should change nothing” does not make sense. Saying that all systems are corruptible does not change that, it just would mean that even the best possible ones still are susceptible. I think you must be misunderstanding what I meant there, or else your response does not make sense to me. “Solving a problem in the in the here and now” is a modification to the system, because the system is just the sum total of the way that society functions, to include the way problems are created for people and the way people react to them. Whatever solution you come up with to whatever problem, the fact that the circumstances to the people around you are now slightly different represents a small but nonzero change in the way things are done, in your society.

In order to solve a problem, it is first necessary to identify how to solve the problem. That step is not “sitting on your hands”, its a necessary component to any useful action.