The witnesses will answer: Those Wicked Angels care nothing for anyone else. They are far to selfish to care about their children.
But...but....but....
I heard from "good JWs" that the reason Halloween exists is that it's the day that the demons mourn their nephilim children who perished in the flood (some bright-bulb JW apparently calculated that the flood started on November 1), and so they terrorize humanity because....well....the explanation sort of breaks down there, but it's definitely because that's the day the nephilim died!
This is all bible based (TM).