Anime & Witchcraft

I've noticed a recent trend in anime promoting witchcraft & occult powers, particularly since 2010's. Very open display of sigils, various demonic entities(depicted as morally ambiguous) & magical rituals(the Western occult type, not japanese). Chaos magic & summoning are particularly promoted. This doesn't look sinister until you research what these symbols & rituals are, which is likely to be blindly imitated by dumb teens (just like ouija boards lead to open possession through nothing but a plain cardboard with letters).
What stands behind this occult intrusion?

>>8
Doesn't Devilman fit all those criteria? And Megami Tensei...