I don’t doubt they exist, but the question is: what are they? There is much research that they are Occult/evil in nature, not ‘aliens’!
I agree.
Many people who fear they have been abducted speak about being in the presence of evil when they are with these "aliens."
I can't imagine a better cover for demons or fallen angels than "aliens from a distant planet"...
Here's another interesting point to support your comment.
Occultist Aleister Crowley attempted to open a portal to other dimensions in 1918 in his CPW apartment in New York and reported that he had come into contact with an entity that called itself "Lam".
Crowley included the portrait of Lam in his Dead Souls exhibition held in Greenwich Village, New York, in 1919.
The first image above is Lam, the second is Whitley Strieber's, and the third is an overlay of 1 and 2.