so after reading a bunch of this why can't these kids figure out that these people are dying like humans?
The "enemies of Humanity" are killing like people, people are being hunted individually, isolated, hidden, and it has been established that they 'hunt' where people are instead of their designated hunting grounds.
They leave no traces, no sign of a struggle, and no motive like the need to feed. I'm deadass about to skip to where someone gets smart instead of lucky.