I would assume more or less in the same way that somebody found out that part of a walkatpus was delicious--most people who tried to propitiate chaos gods died horribly, but some found gods that were willing to strike a deal.
Remember this happened in a time when the gods of the people had almost all left, died, or otherwise become of no help in the situation. Most people died, a few found ways to survive. Faced with near certain annihilation, people may try almost anything.
Although I'm willing to concede that cannibalism may have preceded Cacodaemon worship-- it was just that the worship turned it from mere sustenance and breaking of taboos into something much more.
Powered by hypermail