Ahem. I take a back seat to no one in my admiration for Alan Reynolds, but I will lose my decoder ring if I don’t correct him on one thing. Demonization is the tactic of unfairly portraying someone or something as evil. Demonology is the study and categorization of demons. It’s science! Or, at least theology! (If you believe in demons, of course).
Legislation by demonology, doesn’t really make sense as a term, but if we have to talk about such things it would be more like tax breaks for succubi, zoning regulations for hellmouths, marriage rights for familiars, immigration status of goblins and so forth.