Even if Charlie doesn't mention that exact research, I did it, and read the same sad story that you did. The history of the human race is marked by cruelty to others, and the purposeful decimation of native populations by ambitious and greedy settlers (or invaders) wielding superior technologies. What that says about the human race is, fortunately, mitigated, just a little, by the works of art of very kind left among us by those whose energies were directed at creation, rather than destruction.
We are all human. And, happily, we are not all bad news.