The stat's collected and presented as validation exemplify the old addage.

House fires do not recieve the forensic's of airline crashes. There are few, if any extensive investigations. Most do not even warrant an investigation at all, so an educated quess by the firechief, or deputy goes unquestioned.
Even if said fire WAS electrical in nature, the factors involved are rarely pursued, i.e: was there a bona-fide electricain? was there a permit? was there an inspection done? Was there any DIY'er involvement? The standards vary so much from locale to locale that a generic compiling does this no justice.
The insurance industry simply pays off, and the matter is dropped & Our trade is held to blame
Yet manufacturer's will use this info , and grab the public by the lapels by advertising firefighters haulin' little girls out of burning buildings in our trade mags!

sparky
former FF, .......bark worse than bite