Don't say humans ain't like that.. the human condition isn't like that, but it's not human nature, like a lot of people seem to think.
Nothing personal but you buddy are to young and naive to understand, if you look the entire human history you will not find even 1 month in a year where there was no war. Its not just war, there is murder, raping, kidnapping, stealing, supresion of human rights and much much more.
The reality is that humans are driven by emotions, dont lie to your self that you have brains and all it's all about emotions and urges or rather to say instincts.
The world is ruled by a handful of persons (up to 1 million rule over 7 billion people).
The nature of a man is to make sure it's own well being that means food, shelter, safety. Thats the raw needs, that is like the begining of a tree, rise more up and those 3 needs go in many many more directions.
For now because of the physical and psyhological state of humans i do not believe that real peace is possible, maybe in 1000 years (even then probably not) we can enjoy peace and prosperity in the world.
Right now if i imagine a perfect world in the deep of my soul i can feel the dislike to such a world because it's so strange and wrong.