This is how so many fires start. Kids are stupid (it's biological, brain hasn't developed, they can't help it). Fire is exciting. Then they go experiment with fire in a place you really shouldnt -> whoops, something burns down because they don't know how aggressive a fire is in real life and how hard it is to put out.

But if you give them the boyscout/camping treatment of having them light a fire so many times it becomes boring, let them play with matches, move burning logs with thick gloves and practice putting out controlled campfires safely it becomes boring, normal, and the excitement goes away.