But disposing of people with fire is. I don't think it's too far of a stretch to say that it's related to the meme.
Actually, it was a favored method of executing heretics and witches during the middle ages. And to dispose of corpses during a plauge. We don't do it in modern times because being a witch/heretic isn't a criminal offense (unless you live in the Middle east) and we tend to use a different method to dispose of the dead in disaster areas...