The idea that you can fix something violates the ultimate law of the universe — probability balance. This law basically says that creation is always offset in time by destruction — stars are born, stars die, peace is offset by war etc.
Now I’m not suggesting that just because problems can’t be permanently solved that one should throw up one’s hands in despair. Psychologically it is always better to be allied with the creative force rather than the destructive. As the wiseman said, “Virtue is its own reward.” That should be reason enough to slog on for good.