[Kaiyou]

Because it's unnecessary. To them these people looked so much inferior, that they even put them into zoos. Now ask yourself, if you found ruins indicating that [insert animal, maybe elephants] used to have an ancient civilization would you find that incredibly interesting or would you want to destroy evidence of that because it might affect the way we think of elephants today?

[novacole]

I think you underestimate the sickness of the people and culture of said people who would put people in zoos.

If you can do that, you can’t put anything past that person/culture.