Its pretty common for a spell to go unexpected isnt it? it probably took the request and amped it up to 100 and made alot of people just forget about him in general.
Im guessing this leads to him going against humans. Probably for the best, as most of the time the demons in these stories are just regular people forced to fight back.
Following laws is fine and all, but being forced to do to stuff that isn't law isn't. They should be free to walk the earth if they wanted, not having to hide their identity.