It is possible for all humans to live in relative peace, granted we won't be a perfect world, but we won't have the wars and genocide that we have right now.
Problem is, it likely will never happen as long as we continue to think the way we do now. Many people argue that Bush and his ilk are turning the USA into a military dictatorship, well, the reality is, it's been a military dictatorship long before anyone on this site was born. Every single country on the planet is a military dictatorship irregardless of the claims their authorities make. Don't believe me? Go to a 'free' country like New Zealand and burn their flag during their country's equivalent of July 4th in Auckland and you will see how much 'freedom' you have. Likewise, go burn the US Flag during a veteran's parade and I can guarantee even your most 'liberal left winger' will try to hang you from a tree. I don't mean to be insulting but that is how every country on the planet is.
Another thing: since every country on the planet is a military dictatorship (a monarchy is basically the medieval version of a military dictatorship), by default every single business, person, and property is owned by the government. In turn, the government is owned by one person or a small group of people. There's no such thing as capitalism or socialism or anything in between, they have nothing to do with your freedom or peace. They have never existed in the course of human history and never will. Does anyone here really think that North Korea's state owned businesses really are 'owned' by the people? Likewise, do you really think you own your house in America? The US government owns everything in this country, the land, the water, the 'free market', everything. Nothing has changed in over 2000 years of recent human history.
Nothing at all. We place absolute supreme power in the hands of one person or a select few, and they protect us and feed us like nice little sheep. They run up more and more debt for various pet projects and in the end, they end up with everything. We have nothing. Then, society falls apart since you can't sell something to someone with no money.
If the top brass (top 1%) in the USA holds 99% of all the wealth and the rest of the masses have the rest, is it logical to assume the masses can buy what the top brass sells to them? If you are in a town of say 500 people and out of $500 million USD floating around in the town, you own $499 million, can the rest of the town purchase stuff worth $100 million? Or even $2 million?
The cycle repeats itself. The 'old money' re-establishes itself in the new society/country/whatever and once again they become the top brass. This is a tactic the Mafia has used to control their territories for generations. The rest of the masses are reconfigured into various new roles; the former upper middle class (yuppies) becomes the new lower middle class, the bottom of the barrel classes basically become scavengers, and the middle and lower classes become cannon fodder for whatever games the top brass desires. The top brass deflects blame from themselves onto various subcultures and groups within a society, whatever is most convenient in thier eyes. The terrorism argument being pushed around in the USA is bogus; the sole purpose of the Patriot Act and all of the DHS activity is for damage control, not to fight terrorism or set up a military dictatorship. In most of recorded human history this is where the tension and wars come from. They pit people against each other, and make up a bunch of scapegoats in the process.
The key is to stop seeing your country as something to be venerated. Patriotism is just another form of religion. After all, God and country is the sales pitch used by groups like the "Constitution" Party and their kind. They go hand in hand; go into any of your VFW branches and they will have all kinds of religious and pseudoreligious symbols and materials throughout the place. Stop making flags and national birds and trees and all the other religious symbols that make up the state religions on the Earth. The first people that understand this will set an example for the world; we would walk into a brave new era for humanity. Time is the only thing that heals bad blood between nations, not more 'tolerance' rahrahs and trying to get mutual enemies to sleep with each other, so to speak. Israel and the Arabs will never stop fighting so long as they never leave each other alone. The Northern states and former Confederate states in the USA will never get along so long as they try to use DC as a means of conquering each other. Trying to force people to accept each other never works, not in the long run. Leave each other alone, and the wounds will eventually heal.
It's really that simple.