One of these 3 things

1. Elite satan worshipers are abducting children from national parks to use in their rituals. (How would they even plan this or pick victims while going completely unnoticed?) They also are using weather manipulation to cover their tracks by making it rain for a week after they abduct children....ummmmm

2. Big foot or aliens are abducting children in forests (again how do they go completely unnoticed? Invisibility cloaks? One of the stories involved a girl going missing in broad daylight while multiple people were supposedly "watching her" yeah right) Again Big foot or aliens also have access to weather manipulation tech and cover their tracks by making it rain for 7 days.

3. National forests are dangerous places where people get lost, hurt, or die commonly. Sometimes bodies can't be found or recovered due to water destroying tracks and the ability to track the missing person. Lots of the disappearances involve water and children which everybody knows kids often drown when unsupervised around water.

Personal story here.

6 of my closest friends went on a camping trip out into the woods of south west colorado. They decided to camp on some land that a friend owned. The group planned on shooting guns at some old junk TVs and computers they brought along. Day 1 they all went out to a near by field and shot at the TVs and had a good time. They decided to go hiking and exploring and later that day they found a river with a small waterfall (they described the waterfall to me as being 50ft high and the river was shallow with rocks showing out of the water.) They all decided to call it a day and headed back to camp. They all got drunk that night and stayed up late around the camp fire. The next morning one guy named James was GONE, vanished no sign of him anywhere. My friends panicked and spent a few hours searching for him. They hiked back up to the waterfall thinking maybe he went exploring and drown.....One of my friends found his shoes and socks at the top of the waterfall but no sign of James at all. If he had jumped off the waterfall his body would easily be visible in the shallow water below. No body no sign of him anywhere. My friends reported it to the police and a full blown search went on for weeks with no trace of James and no body was ever found. My friends were all really shook up by it. My friends had a theory that another guy with them "Eric" didn't like james and Eric must have killed him and hid the body. Problem with that theory is Eric and James were roomates, best friends and I never once saw them fight.