@happyhunter
Okay, I'll bite.
Despite being a certified nutter...
Nutters have at least some evidence that are perhaps based in logical fallacies, but are there never the less - you do not have that. Nutter status denied! By the way did you just admit that you lied on your firearms application (I assume you are an owner of a few)?
this lunatic had no trouble obtaining a firearm illegally.
Absolutely agree - this lunatic did obtain an illegal firearm. However, you have no knowledge whether this was his prior to buy back or what trouble he actually went through obtaining one. But, for argument sake I will humour you - yes you are right - now imagine every lunatic... This is what you are proposing.
Maybe you haven't heard of the 'four winds shotgun?' A 5 year old could make one.
I doubt a 5yo could make one, but I see your misguided point - I did say no more effective than a knife. You will get a shot, sure, same with a knife, same as a stick and a chair. You will get tackled when you try to reload. Cherry picking - a big no.
Like Gwion says, everybody is entitled to their opinion and you obviously can't handle mine so best you take another happy pill to settle those emotions

That's adorable, rather than presenting something factual and quantifiable, you deflect, resort to personal insults and to be perfectly honest reinforce my point.
Your argument and I use this term as loosely as possible in your case, is a blank. It is baseless, it's backed up by nothing, no data whatsoever, not even a statistical blimp - in science, what you did is called cherry picking, in human folklore it's called a dipshit.
You are doing every shooter in Australia a disservice by advocating views (as well meaning as they are) that you, I and everyone else knows are impractical, impossible and cannot be achieved. The flip side to your misguided 'argument' is that you are providing all the ammunition for the anti's.