The Smallest Minority points out that this happened yet again. Australia is following in the footsteps of New York City and Berkeley, California.
The reason given for the seizures is classic liberal nanny-statism (i.e. socialism/communism):
Mr Moroney said that, as part of the blitz, thousands of weapons were destroyed because police were not satisfied that the firearms were being kept securely, or that "possession of that firearm was necessarily further warranted".