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.
A big part of our show is the idea that endings aren’t real… In our culture, one of the more damaging things we can tell our children is the idea of ‘happily ever after’—that you’ll find the prince or slaughter the dragon and be happy forever—but that’s not true. What happens the day after you slaughter the dragon? You still have to get out of bed.
Diane Nguyen actually takes the quote closest to this, when she talks about her wedding, but its the reality all the characters are realizing
Happiness is the consequence of personal effort. You fight for it, strive for it, insist upon it, and sometimes even travel around the world looking for it. You have to participate relentlessly in the manifestations of your own blessings. And once you have achieved a state of happiness, you must never become lax about maintaining it. You must make a mighty effort to keep swimming upward into that happiness forever, to stay afloat on top of it.