Pacifism is a term most commonly used by those who promote violence as a way to peace. There is no such thing as a "just war". To wage war for nationalism is to sit in judgment of others. That is against Christianity, regardless of how many churches agree with it.
Chaos is not the path to peace.
To look at the question from a larger perspective, peace on earth is not the ultimate goal, becoming a part of the Kingdom of Heaven is. "Pacifism" is what gets you there. If you love this life you will lose the next. Fear God, for only he has the power to let you enter. Do not fear what may happen to you in this life.
The struggle for good and evil is really a battle being waged on a personal level. "Just war" has no meaning. Aggression is a manifestation of politics. Politics have no place in the Kingdom of Heaven.
I prefer to think of pacifism as the means to unity and equality for all. The true path to peace.
"For God so loved the world, He gave his only begotten son. That whosoever should believeth in him, should have everlasting life."
God created us for love, so to truly "be all you can be", be a part of Gods' love. It's the same yesterday, today and forever.