"My relationship with you is not with you as you see yourself, but with you as I see you."
- Eknath Easwaran in his Introduction to "The Dhammapada"
The world we see is coloured by who we are. If we believe people are fundamentally good, then we see primarily goodness in the world. If we believe people are primarily selfish, then we see only selfishness, scheming and cruelty. We see as we are, and our interactions with others (our foreign policy, if you will) follows what we see.
To change the world, we merely need to change ourselves.
How? Start by slowing down your thinking. Much of what provokes us is projected by our own mind. You, as the observer, affect the observation. Recognize your thoughts for what they are - just thoughts. There is no need to turn them into action. Your thoughts are not you. Just let them go.
Practice this for a week and see if your world changes just a little. Then imagine if we all did this.