Yeah I saw that on CNN too. It seemed to me that the reporter from Melbourne said that a certain percent, can't remember exactly, of wildfires are started by human activity, but she didn't say that it was suspected. Maybe I'm wrong, this was yesterday morning and maybe more evidence has been found? It seems unthinkable that someone would really do such a thing intentionally.
I hope not at least. I'll pray for the victims their losses have been great.
Peace
Alex