Presumably a conviction for arson requires proof beyond reasonable doubt of BOTH that a person started the fire and that they started it deliberately???
Some may have had the charge reduced to a lesser offence?
Printable View
I guess there may also be the confounding factor where a single person had multiple charges rolled into a single conviction. But its still a very low conviction rate.
There is also a legal definition for arson that wouldn't be satisfied for a lot of bushfires.
Fire Setting would most likely be the line of charge or something along the lines of reckless use of fire.
Martyn