The Australian Climate Madness site has a level-headed post on the meaning of the floods.
It's difficult for people who don't live in Queensland to understand the volumes of water we're talking about here. This is not some drizzling Victorian rain or misty English weather. This is a proper, tropical summer monsoon rainfall a bit further south than it normally is. The written history of Queensland is only about 200 years long, but it is peppered with tales of huge floods that astound new observers. People see the 1974 markers on buildings around Brisbane and think it can't possibly have happened. The puny infrastructure put in the way of these periodic deluges is nothing compared with the water volumes. It will happen again, at least once per lifetime of the average person. There's nothing that can be done. After all, it's just weather.