Re: There are those who did know . . .
These are the ones people tend to lose track of, because they are completely knuts -- and I have no doubt they know that as well.
Jim Jones had no plan once he had built his Jonestown and swindled his followers out of their money, and to going to Guyana. He was painting himself, and his followers, into a corner. He knew this. He didn't care. He had achieved his goal. He had become a god on Earth, and all of his devout followers knew this.
They will argue they were right, but their realized insanity drives them to suicide.
Dan