Cultists. They're like cockroaches. We humans are incredibly fine-tuned by evolution for the task of spotting coincidences and causal connections. It's a very useful talent that dates back to the bad old days on the savannah (when noticing that there were lion prints by the watering hole and then cousin Ugg went missing, and today there are more lion prints and nobody had gone missing yet, was the kind of thing that could save your skin). But once we developed advanced lion countermeasures like stone axes and language, it turned into our secret curse. Because, you see, when we spot coincidences we assume there's an intentional actor behind them-and that's how we create religions. Nature does weird stuff, so it must be governed by supernature. There's lightning in the clouds: Zeus must be throwing his thunderbolts again. Everyone's dying of plague except those weird folks with the strange god who wash every day: it must be evil sorcery. And so on.