I don't comment on the Second Amendment or guns in general. I leave that to the professionals. I did find this interesting though:

From 1999 to 2002 the number of robberies involving firearms in Sydney's most populated areas rose by 34 per cent, while handgun homicide has grown from 13 to 50 per cent since Martin Bryant killed 35 people at the Port Arthur tourist site in Tasmania in April 1996.

(via Tim Blair)