The desire for immortality, as have human souls. And deviant tendencies of non-humans - playing with human DNA, gives ability to host entities in such a modified physical body, which has a very low vibrational frequency. This low/loss entities, under certain conditions, to enter their "means of transport" - in the DNA of a modified human body (for example programing MK ULTRA or rituals).
If you accept that we are living in a simulation, then I would call it hacking via imperfect program - Cain's bloodline. This is also where the metaphor of the serpent from paradise comes from. The name "Apple" is not accidental.
LOL Yesterday I was doing an experiment on changing the vibrational frequencies. My apple phone was lying on a black wooden table and several times during this "exercise" it completely disappeared. It was as if it wasn't there at all. Repeated several times.
It's all only about vibrational frequencies that affect matter (and therefore bend time and with it space).

Just as different vibrational frequencies keep certain things from being visible to us, yet animals can see them (or sense the negative energy)? I had a friend years ago who could see things that most people couldn't. she said to one young woman, "I see a butterfly flying around you that looks like the Lunesta butterfly; does that make sense to you?" The woman said, "Yes!!! I just bought some; took it once and was seeing demons." She told her to throw that stuff in the trash. I suppose certain pharmaceuticals are changing frequencies as well, into something they're not supposed to be.