Crime exist in ANY country. Do not know of Australia, though, but in those I had visited so far - definitely.

I do not say that I will be raped, killed or robbed if I do not have a gun. I want to be prepared for the case of attack.
If I do not have a fire extinguisher that does not mean that otherwise I will have a fire. But I want to be prepared in the case of fire.
Defending yourself from fire, attacker or whatever is NORMAL and NATURAL.
If I will be living alone i will have a gun. Because the only person who enter my house when I live alone is a criminal who is threatening me. And for me my life is more important that his.