It's cyclical. Bushfires usually come at the end of a long drought, then there are heavy rains for the next few years, then the drought starts again. I am old enough to have seen it happen several times like this.
One of the issues in Queensland is that the drought has been so extended, and the monsoonal rains have taken so long to come, that people have become complacent. If you look at the coverage, you will see quite a few old buildings bult up off the ground, as on stilts. These are affectionately known as "Old Queenslanders" and they were built like that for a reason.
But people who have moved to Queensland from southern states have opted for low-level/ground-level houses, removed or destroyed the old Queenslanders, built their new homes, and are now paying the consequences.
One of the real positives out of the rainfall is that the artesian basin -- an undeground network that contains an enormous quantity of water and covers a huge area of what essentially is dry, desert-like terrain -- will be replenished. And many of the rivers which have been struggling to maintain any sort of flow will be flushed -- albeit with a large amount of red silt in the water.
It's part of the renewal process. Even the bushfires that I lived through in February 2009 were much like that. It's just a shame that they killed so many people and completely entirely destroyed so many residences.