The point here seems to be a fear, however well or ill based, that fisticuffs or other violent friction would occur. That would be a valid reason to ban the items. If they weren’t banned, it was because there was no such fear. I detest the devil; the devil is my enemy and his servants are dupes. But I would give even the devil the benefit of law (google “the laws all being flat”).
There’s a lot of metal that isn’t satanic. There’s plenty of Christian metal out there, including subgenres like black and death metal. That simply is choosing the medium to communicate your message, when it isn’t based on something like a book or story of some sort.
This is a concept album about the creation of Earth and mankind. Lyrics are in the description.
http://www.youtube.com/watch?v=GwDK77IF69s