Demons, or any kind of spirits really, are just energy with a pattern , no? Frankly, if you want to destroy a demon, what you have to do is disrupt the pattern. I am not exactly sure on how you would go about doing that, but the reward would literally be a mass of unused energy.
That would be like disrupting a pool of water, sure you could stir things up a little bit, but since Spirits are pure Energy, they are like catching wind. Material things break, Energy do not, not, it is like the old saying that you can kill a man but not his ideas.
And I don't buy into the idea that, once the pattern is disrupted, the energy will be "malevolent" or "tainted". It's just energy. Read more about that and Direct Magic at The Library of Knowledge (quick google search).
How do you assume magic works at all if energy is not influenced at all by will and what it is used for, how do you then explain that energy who used to be a creature full of ill will is not affected by it? That being said I think that 99 percent of all creatures, Spirit or matter simply do things for their own motivations, we call others good and evil by how their motivations affect us, and how they stand according to the systems of morals we ascribe to, however in my experience, good or bad energy is affected by what it is used for.
Btw, I forgot to ask. Has anyone else noticed a few things attached to this thread (and not just the pointers)? Did someone leave something behind to watch this thread (trip wires) or is just some people getting energetic leaving impressions regarding the subject?
I have not really felt anything on this thread, but then I have spent five minutes now replying and not really done an effort to try to feel anything either, but to me it do not feel anything different than other threads on this forum, but that might just be me, what are you feeling?
*Learn magic for it is the only truth of this reality, become magic and you will become the essence of that truth--Ars Magica
*Cats are magical, the more you pet them the longer you both live--Unknown
*The universe is full of magical things, patiently waiting for our wits to grow sharper--Eden Phillpotts