The following story is not meant to be funny, but illustrates how unsupervised kids with fireworks can cause a catastrophe....
A friend of mine and his buddy were about 12, over at the buddy's house, blowing up models. They had an aircraft carrier. So they packed it full of firecrackers and bottle rocket heads and floated it in the creek behind the buddy's house. Then they thought it would be cool to have flames, so they poured out a can of gasoline onto the aircraft carrier. Then when they tried to light it, the lighter didn't work. So they walked to the house and got some matches. When they came back, they lit a match and threw it at the boat.....
Well, WHOOSH! The entire creek lights up about 50' down from them. While they were gone, the gas moved downstream. So now there's a 6' wall of flame about 50' long moving down the creek setting shrubbery on fire as it passes each subsequent piece of property. They ran inside and told the kid's mom. She comes out to look, eyes get huge, and she runs back in and calls the fire department. Takes the fire department about 5 minutes to get there, and several minutes to get to the back yard. By then, the fire is about 100 yards down the creek and starting to diminish.
Fortunately, it was a very wet area, the bushes were green mostly, and about all of it went out before the fire department got there. However, they had to go through about 10 yards and spray down smoldering shrubbery and such.
Both kids were charged with arson.
The charges were eventually dropped, and their parents had to pay some fines and restitution for some of the landscaping. All-in-all, it could have been much worse if it had happened in a different location, a dry area, etc....
When my friend told me about the fire the next day, he was actually very remorseful and scared. I could see it in his eyes. He was just shaking his head in disbelief at how far that gasoline traveled downstream and how much fire there was when it first went WOOSH!
Now we still blew stuff up after that, but we never messed with gasoline again. Sometimes you never know or learn until you see it for yourself. His story was good enough for me.