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.
Certain situations need a Jedi-like approach. One of these is when you are in a strange environment, usually where you feel unsure of yourself. You would be surprised how, if you walk with confidence and meaning, people will see this as a mark of confidence, yet you are perhaps shaking inside but outwardly you have the gait of a confident Jedi Knight.