Satan knows some seed of the woman is going to bruise his head. He didn't want that to happen so his plan apparently is to try to kill every human being on the planet. He wants to kill everybody. Remember when Herod wanted to kill baby Jesus in Bethlehem? What did he do? He slew all the children, "Let's just kill them all to be sure to get the right one." Satan wants to kill every human on the planet. And some of his followers and helpers down here are working at that goal right now.