The the Port Arthur massacre was a cover up.
The weapon that Bryant used was traced and found to have been recorded as destroyed after being handed in during a gun amnesty in Victoria.
Why was someone with a history of mental illness able to get hold of a destroyed weapon?
The fact is that the gun laws have had zero effect in regard to criminals gaining access to guns, all they are doing is making it harder for law abiding citizens to own firearms.
Cheers
Paul