Because powerful people basically never relent their power willingly. E.g. Netanyahu, trump, putin, and the countless other fascists destroying the world for profit and more power. History shows us that power must be taken from those who would misuse it. We must be ever vigilant to not become those we despise in our efforts to end their reigns of terror lest we perpetuate the cycle.
or
2. Dont participate or contribute to the system as much as possible. ie Working at big unethical corp for a fat paycheck is not helping things.
There are other ways as well. but those came to mind
And good luck changing every educational system in the world.
This is probably how the whole world was made, interim solutions hacked together. I wonder what social system will have evolved by the time our descendants are no longer recognizably homo sapiens (or even biological)