It's interesting how this has become a discussion about gun control.
The fact is no matter what laws you pass or change bad people will always find a way to harm others.
Including obtaining guns illegally. We have very tight gun control laws down here and this has made no difference to the availability of guns to crooks. If anything they are now more available than ever before.
For instance and old M16 is about $600 on the black market... 9mm pistol, about $300. You name it, you can get it.
Recently a local biker was caught with a Barret 50 caliber rifle... (bolt action non Mil version) That gun was never sold legally in Aus and yet somehow the crooks have no problems getting them
The issue here is what caused the rage. If merely honking at someone enrages them enough to want to kill you then something is clearly wrong with that individual.
That's what the law and the police should focus on.