Because more times than not the names we physically call them aren’t their real name and an imposter doesn’t affect their life, it affects the life of the one that fell for the imposter. Lilith for example has enough responsibilities running what she has to than to worry about a random individual in another plane.
Not to say she doesn’t care about certain individuals here, and no one can really speak for her so this is really just my own opinion, why would she care about it? we have people here who steal our identities but it affects us worse than if an imposter were to claim they are her to us. It doesn’t affect her livelyhood, her family, her dominion, it only affects the practitioner.
Now I do agree many of these demons who people are so quick to attack a newbie on for being negative can very well be negative. Lilith can be parasitic if she wants, Belial can attack someone if he wants, hell if people believe Yahweh attacks people a God then a demon is no where out of the possibility.