You would not need to ask this question if you were aware of the power of evil.
I doubt if anybody of a reasonable age with some experience of life is unaware of it, Al.
The difference is that for some reason you seem to want to make it some sort of metaphysical force caused by a great big supernatural baddy. Needless to say, there's no more a scintilla of evidence for that than for anything else you dream up. It was I think Joseph Conrad who said, quite rightly, (paraphrasing here) that humans alone, just humans, are capable of every kind of wickedness; no need to go around inventing devils and demons to explain it, because that's just a rather childish cop-out.
That also applies to goodness, however.
