Leaving children alone really depends on the child. The 5 y/o in the above story seems bright enough, but this is a sick world and a creep could have easily "helped" the little dude out. If I see children running amok or more often having the people in the next camp becoming unruly, do what I do, have the wife tell them off. Then if things really start to get out of line I can step in and be a hero.