The gun grabbers say that guns take lives, but it can be equally argued that guns are tools, capable of being used for good or evil and often save lives. Here are some examples from the United States:
http://www.wsaz.com/content/news/Police-Two-shot-during-home-invasion-in-Logan-County-455197643.html
https://bearingarms.com/tom-k/2017/11/08/man-saves-older-brother-shooting-two-three-attackers/
http://www.theblaze.com/news/2017/11/07/home-intruders-beat-up-knock-out-resident-but-his-younger-brother-comes-to-the-rescue-with-a-gun/ns
https://pamelageller.com/2017/11/americans-need-guns.html/
Then there is the classic American argument that ultimately only armed citizens can resist government tyranny:
https://www.amren.com/commentary/2017/11/hatred-whites-stay/
That argument does not get much track in Australia, but then again, not much does, because this is a culture which has not yet experienced great suffering, beyond a rise in beer prices.