It's certainly a big problem -- has always been so and will remain that way. Maybe you could open with a quote from the musical, South Pacific: "You've got to be taught to be afraid, of people whose eyes are oddly made, of people whose skin is a different shade, you've got to be carefully taught..."
Then you could lead in with the idea that racial prejudice isn't something we're born with but something we learn from our families, our teachers, our clergymen of whatever breed, and our peers.
Idealistically (and it is certainly idealistic) you could posit that if only we could persuade people to stop teaching racial hatred then it could die out.