I finished the video this morning. It was a very interesting interview. I'm glad they touched on 9/11 too. My assumption would be that there are many different "races," and some of them are not friendly. Our politics are a nightmare on this planet. Even the politics of a tiny HoA can be maddening. Can you image how complicated it would get at a multi-planet level let alone galaxy or inter-dimensional?
RE: The denialists are just like the defenders of Ptolemy: They come up with epicycles on epicycles in order to avoid conceding that they have the wrong null hypothesis.