I’ve met many people that squat in the bottom of that canyon.
There are no facilities.
Its very isolation is its attraction.
I think cops and cleanup crews come in from the ocean, because it is such a nasty hike to and from the top.
Most hikers know if you take a dump. dig a hole, crap in it, then bury your feces, and the paper if used.
They must be tourists that don’t know better.
They certainly aren’t locals or experienced hikers
in primative areas.
Check what I just said. I was thinking Waimea canyon trail.
This Kalalau Trail is much better maintained and watched.
I live on the Big island. So forgive my geographic error.
My comment is valid for Waimea canyon.