Soylent Green Is People said:
Irvine Commuter - perhaps those at the Bataclan may disagree with you. No matter the weapon of choice - gun, truck, bomb, knife, poison, there are plenty of mass killings that are not gun related. Everyone loves the stat that Australia banned guns and killings were reduced... a good thing... but they fail to mention that the crime rate soared thereafter - a bad, and ongoing problem. Oh... and criminals still have access to guns.
Australia did not ban firearm ownership. They imposed stricter licensing & permit system and restrictions on semi-auto firearms. The mandatory buyback program (mostly semi auto firearms) after the port author massacre destroyed about 1 million firearms, and in the 2 decades since, Australian gun stores have imported and sold about one million firearms (mostly manual action long guns). In effect the buyback program was a huge boon for Australian gun stores.
http://www.abc.net.au/news/2013-01-14/australians-own-as-many-guns-as-in-1996/4463150
IMO the biggest difference in "end result" between AU and US gun laws is not on the restrictions placed on semi auto center fire rifles. It's AU's stricter requirements to purchase and own handguns. The media loves to cover mass shootings by AR15's, but in terms of total gun related fatalities, rifles account for only a very small fraction compared to handguns in the US.
https://www.nytimes.com/2014/09/14/sunday-review/the-assault-weapon-myth.html
So if anyone here oppose sale of AR-15's but support the right to own handguns, it's actually an illogical position. If the goal is to reduce total number of gun related deaths while retaining ownership rights of some sort, imposing mandatory trade-in program/stricter licensing for handguns and giving out rifles and shotguns in exchange may actually produce the desired outcome better. i.e. trade in your glock for a Beretta A300.
As for the mental health issue, part of the problem is that our culture is cliquish and dog eat dog. We don't provide a healthy, supportive environment for people who are emotionally and mentally stressed. When enough people are made into outcasts, at some point one of them will flip out and massacre their target group by firearm, vehicle, explosive, fire, blade, whatever. They don't feel like there's any chance of their grievances being addressed and nobody will lend a supportive shoulder and ear. Instead they go on the dark corners of the internet where others with similar mindsets egg them on to commit mass murder. I've personally read commentaries calling massacres "pest control". How many years of hate does it take to reach that point?