Well, actually, that 18/2 extension cord is an electrical fire. That is the way that the statistics are gathered. An electrical appliance that starts a fire is also an electrical fire.
A long time ago, EC&M, I think, ran an article that was titled" All Those Electrical Fires, Hogwash." In the article, the author referred to a fire report that stated the cause of the fire could not be determined because the building wasn't wired.
Few things are harder to put up with than the annoyance of a good example.