Sorry for the confusion Lynn. I was not denying or questioning their dangerous nature. I was instead only trying to muse on why they seem to work so damn well. Seems you were able to shed some light on that piece of my puzzle too - which I think I'd summarize as "the more that play together, the less merrier those dangerous results can be"
Having never played with a Ouija board before, I doubt I would have thought to "close the door". As a Wiccan student I certainly know the importance of that control from doing circle work. But, like any other uninitiated lay person, I would probably careless leave open a portal to all kinds of stuff. Thanks for the repeated warnings on this point Lynn.