WW3 or World Peace?

I have always wondered why do nations turn to war, violence and many other terrible things whenever they disagree with each other for some reason. The irony of that issue is that their leaders are firm believers that by war is the only way they will attain their peace. But their leaders should not be the only ones to blame but also those citizens who have such strong nationalism and are willing to defend their country at whatever cost. Donald Trump, Kim Jong Un, Vladimir Putin, are the complete opposite of what it is needed to finally attain the world peace many of us are wishing for but unlikely will ever get to see. They rather contribute to the possible and terrible start of what would be called World War 3. World peace though, can only be a wish since it is almost impossible to satisfy and make everyone agree with each other so I do have to be realistic and face the possibility to never get to see that. We live in a world where hate, violence, and disgust among individuals has been part of our daily lives and it has become something normal to see everywhere. In my opinion the world is moving undoubtedly towards a third world war -a strategic nuclear war. I do not believe that anything can be done to prevent it. As much as it hurts to admit it we have to face the truth of what is coming and in my opinion it will mostly be between the ones I mentioned previously, USA, North Korea, and Russia since are the ones known with nuclear weapons, as well as other nations who might intervene along the way. As citizens, we must join together in harmony and speak out for peaceful and safe directions for all of us to see what we can attain. This means now, if we are to have any future for humanity.