Bad counselors.

In the first movie, you get the sense that Mrs. Voorhees is generalizing that all camp counselors are incompetent and that children will die because of that incompetency, and so you feel bad for the counselors in the first movie because they actually seem to have potential. They save Ned from drowning, they chase down some kid yelling "help" in the woods... some other stuff. But Mrs. Voorhees doesn't give them a chance.

Then you see what would have happened if she gave them a chance.

* Two don't even make it to camp and the others don't care, leaving a whopping four teenagers to run the whole camp.

* One leaves the camp for a date.

* One also leaves the camp for a date.

* One is busy playing practical jokes.

* A little girl walks up to the last counselor with a bloody machete and tales of some bad man chasing her around, and the counselor sort of brushes it off as a practical joke despite repeated warnings by various people multiple times that there's a murderer on the loose.

I think that the only thing in the entire franchise where the children are actively protected by the teens/adults is the NES video game, and even then you can sit back let Jason kill all but one child.

11... 92... 12...