Is war ever necessary?

I do not believe war is necessary. For one thing, it is usually spawned from a fight over power. Different countries wanting more land, more resources, and more wealth. (Gold, God, and Glory, basically.) This is one of the most naive things to start a war over, in my opinion, because the three G's shouldn't be one's main priority in life.
Secondly, the cons of war significantly outnumber the pros, especially when dealing with the outcome. Many people are killed unjustly, and the level of brutality and rashness increases among people.
War is like an attitude; it brings a sense of fear, rage, and sorrow to many. I feel that war brings people further from a utopia, which is a generally desired state of being.

So in conclusion... war = bad.