Jedi do not fight for peace. That's only a slogan, and is as misleading as slogans always are. Jedi fight for civilization, because only civilization creates peace. We fight for justice because justice is the fundamental bedrock of civilization: an unjust civilization is built upon sand. It does not long survive a storm.
A tale is told of twin boys born to different mothers.One is dark by nature, the other light. One is rich, the other poor. One is harsh, the other gentle. One is forever youthful, the other old before his time.One is mortal.They share no bond of blood or sympathy, but they are twins nonetheless.They each live without ever knowing that they are brothers.They each die fighting the blind god.
The dark is generous, and it is patient, and it always wins. It always wins because it is everywhere. It is in the wood that burns in your hearth, and in the kettle on the fire; it is under your chair and under your table and under the sheets on your bed. Walk in the midday sun, and the dark is with you, attached to the soles of your feet. The brightest light casts the darkest shadow.