The idea of a demon/human hybrid is just too NASTY!
You got that right... it's repellent, it's abhorrent, it's mind-boggling and it's too weird and strange -- which is why some in the church have gone through some twisting of the text and "contortions" to make it say something else, other than what it does say.
And that's also why these are the angels who are held in prison permanently, never to be let out again.