Wouldn't [they] want to kill the opposite? The whole "Nephilim blood-type" rabbit hole is not one I've extensively explored.
Trying to assess the "angle" on this aspect of 'The Plan"… assuming everything on this level is. It's a bit of a psychological cluster fuck.
Strikes me as yet another sign, in a long list of them, for the good people to take God's warning and get out before it falls into the ocean.