To be clear hear we're talking about the pieces of cleverness that encode understandings of "evil, specifically" ya?
It's pretty much the definition of "cutting corners".
It's saying "I'm willing to relax my principles for this".
This creates a GAME for any effective "demonic" existence in your mindscape: see if I can get this idiot to do something that I think will be "enjoyable".
Usually, that existence in the mindscape exists where and as it is, as a "demon" specifically, is because what they enjoy watching generally breaches consent.
Then nobody's perfect. There are acceptable limits to misbehaving.
The biggest mistake, I think, exists in opening up leverage for them to convince you that you as a whole are no better than them for merely having them as a part of that whole.
Usually the process is "read what it spits, figure out why they put it out towards you (occasionally disassembling their state to understand this), finding out whether it actually contains evil (usually does), and then do what thwarts it if you can figure out something that does."
This is what the process that normally "blindly" contains such things, the "gates of hell" normally automates.
This is one of the reasons that when something is summoned out of that oubliette of the mind, you have to be exceedingly careful.
*The harm and the extent seem to vary greatly by what, exactly, you give ear to in the moment