One thing I like as a Scout mom is the Leave No Trace walk at the end- line up and walk through the space you camped, picking up anything your group, or previous groups, may have left.
It is amazing how a visual, "Yup, looks good," will then reveal, after the Trace walk, a bread bag full of random trash items. Let alone, "oh, there is my (random item I did not realize I had lost!)"
And you feel good about taking care of things and being responsible.
Maybe I am just weird. But I like teaching that to kids. "Look what you can find when you clean up!"
And the fire? I bet half the kids had not yet earned the right to "do" fire, let alone abuse it like that group did.
And for leaving the kid, NO comment, or I would get in trouble.