If people keep guns for self-defence, all that means is that burglars and so on carry guns as well. So someone who just wants to knock your house off for a heroin fix suddenly gets in a position where they might have to kill you, or be killed themselves. No-one who invades your home is going to want to add a murder rap unless they have to. I've been burgled, and really, it's not that big a deal. You just buy new stuff on insurance.
I wasn't going to post this initially because I didn't want to drive traffic to this unctuous fool's site, but you really do need to see what passes for a man in some Australian circles these days.
And judging by the comments, his readers agree with him.
[Thanks to Jason M]