We fight on Earth to defend the colonies because it is our duty.
You're annoying. Go away or we'll blow up the colonies.
Umm.. We fight in Space to defend the colonies because it is our duty.
You're annoying. Go away while we subjugate ourselves to OZ.
Umm.. We still fight for, uh, everlasting peace.
Zechs and Treize
We want peace too, and just to prove it we'll blow lots of stuff up.
They all FIGHT. A LOT. Then there is PEACE.