Perhaps travel cannot prevent bigotry, but by demonstrating that all peoples cry, laugh, eat, worry, and die, it can introduce the idea that if we try and understand each other, we may even become friends.
Don't go around saying the world owes you a living. The world owes you nothing. It was here first. If you don't like something, change it. If you can't change it, change your attitude. Change will not come if we wait for some other person or some other time. We are the ones we've been waiting for. We are the change that we seek.