Advisory: long reply
I donāt see them used mostly for harm or even mostly for good. I see them used both ways here.
Generalizations generally fail.
Summer is hot until you have a unusual cold snap (could cite historical evidence if Iām asked BUT itās not relevant to this thread and magical pet se so Iām not citing it now).
Deserts are always dry and hot but then thereās a snowfall or rainfall in one.
Generalizations are always disproven by their exceptions, so why generalize that demons are from hell or why generalize demons are for harming?
Just as each magickian is an individual so are demons, angels, gods, goddesses and even aliens (if they exist). Treat each as they prove themselves to be and donāt treat a being human or inhuman like a villain until you know if they are one by their actions with regards to you yourself specifically.
All you have is the say so of people (both historical, literarily and currently in various places) who have vested interests in their claims. Who would call an exorcist and pay him if they thought the demon lover/spouse of a person was helping them and good for them?
How would preachers get their massive collections of money if they didnāt scare people about demons, the devil, hell and how you gotta do this or that because their holy book says so?
I forget who it was but someone (not me) once said take each as they prove themselves to be not as we think they ought to be (my wording might be a little paraphrased but I know thereās a saying by someone that basically says just that).
Besides which, people (and likely entities) are inclined to treat people as they are treated, if you treat them like a villain theyāll be a villain to you. People tend to live up or down to our expectations (relative to those expectations) and often have the view why bother trying to change the mind of someone whoās minds already made up. That being the case why wouldnāt demons respond similarly?
Why not take them as they are to you not as stories by people with vested interests claim they are?
In my own experience, spirits are not always malevolent or out to harm they donāt thirst to do evil they are similar to us in that they have positive and negative qualities they arenāt all good or all bad just like humanity they are both depending on the situation. I know the entity I had an experience was not malevolent or evil it was actually kind of nice and good in its own way.
Add: and to avoid making a long reply longer I will not go into details of my experience here. I mentioned them on other threads already.
Last add: as to why people ask them for help with whateverā¦ usually all other alternatives have already failed and itās ask the demon to help or accept the situation and leave it as it stands and depending on the situation thatās not always an acceptable outcome (leaving it as is).