It's really not a problem. The number of people killed by random violent acts (with or without guns) is negligible. It makes for great news bits though.
Violent crime has been on an uninterrupted downward trajectory for decades.
Many other risks are far more significant.
The overwhelming majority of firearm murders are criminal vs criminal - that's not a gun problem, that's a problem of economics, poverty, and War On Drugs collateral damage.
Don't read too much into the fact that protocols and drills for this exist. We Americans wring our hands over lots of things sensible people in less excitable nations don't get worked up about.
I don't worry about random crime any more than I worry about a house fire. And by that I mean I have basic preparations for both, and that's all.
I would have thought an Aussie would be led angsty about this subject, surrounded as you are by freakishly deadly snakes, spiders, and kangaroos.