Thanks to everyone for their comments. What this has brought out is the old Australian notion of 'mateship' i.e. sticking together as a community and helping out. There were entire towns that were wiped off the map, but already the homeless are saying they will rebuild. There are concerns the death toll will reach 300 as the fire services and police sift through the rubble.
As for the arsonists there are a couple of suspects, but even if they are caught, murder would be very hard to prove. You have to have intent, i.e. you knew when you lit that match that you were going to kill someone. They can claim they didn't know the winds would blow that particular direction.