Well, I'm in Australia and we have reasonably strict gun laws. Still the mass shooting (3 killed, 1 injured) in Bogie (yes I know) Queensland just a few days ago still shocks us.
The shooter was denied a gun 10 years ago but appealed and had his gun ban overturned in the courts... it's inconsequential but interesting nonetheless.
There are also a flood (a trickle, I suspect, compared to the US) of illegal firearms, but it remains in the domain of gang wars and retributions. The large majority of farm gun owners are law abiding citizens.
Still, you don't need an AR-15 to shoot foxes or rabbits. Then again we don't have bears/wolves, etc. (the snakes and spiders kill you first)
Anyway, maybe this illegal gun culture thing is an American thing - but it would seem like most mass shootings are done with legal firearms (as in the case in Bogie), so I'm not sure if it's a real strong argument.
Yeah illegal guns are a problem (there was one case where an innocent person got killed by a stray bullet years ago), but I can only go by my experience here. Even with guns, legal and illegal, tougher gun laws do seem to reduce mass shootings of innocent people.
