Those topics are not intended for the public. The public does not like to hear this as the truth will raise the hair on your back. It's the same reason you don't tell children horror stories. Of course we can discuss it on this forum but just think about it what will happen if it will be made public. If you ask scientists in private, especially archeologists digging around in ancient mass graves of victims of huge catastrophic events, many seem to know the truth, but don't want to believe it.