So you'd let mentally unstable but law abiding citizens have guns???. Most whackos "abided by the law" before they snapped, despite many of them exhibiting behaviour that does not correlate with responsible gun ownership.
Should you allow mentally unstable citizens own anything? Should they reasonably be able to own cars? Gasoline? Fertilizer? Knives? Who is defining "mentally" unstable? (and btw, I do believe that spending more funds on mental health is a wise societal investment, regardless of the gun control debate)
You can't make your position while ignoring the fact that in your example, a mentally unstable person can do unbelievable damage without firearms, as has been proven time and time again throughout history, including recent history.
So then, here's where you have totally lost credibility. Gun Control means just that...controlling who has access to guns and which guns they have access to, lessening the risk to the many by the few.
Except that is not at all what "gun control" entities want. They actually want no guns but knowing that you don't build Rome in a day, they simply boil the frog very very slowly. And, in the case of the US, they wanted not only background checks they actually did want to ban a very very long list of firearms amongst other things. In the case of the UK and Australia they simply went a lot farther and actually seized lawfully owned private property with very little or no compensation. So you see, gun control isn't just controlling who has guns.
That's what sensible countries do anyway...like Canada for instance.
How's that working out in the GTA as of late? Right, criminals don't get licenses, they don't register guns, they don't apply for ATT's and they don't follow the laws, period. Have you noticed that with the demise of the LGR there hasn't been blood on the streets (contrary to what the CGC whined and wailed about)?
And just to circle around to my point, anyone who lives in a relatively free/democratic society and yet their words/actions push "potentially guilty in the future" until "proven innocent (forever?)" and therefore should have restrictions/sanctions placed upon them is not only irresponsible, but extremely dangerous. You see, in a democratic society we're "supposed" to be innocent till proven guilty. We have a criminal code system with prescribed penalties for bad behaviour and those penalties are designed to encourage compliance. It's not until you actually commit a crime and are caught, and
convicted that you should be subject to criminal sanction.
If you are saying that because there is the potential for a person to abide by the law and could potentially "snap" and therefore they should be subject to restrictive sanction, you just described the anti-thesis of a free society. Assuming you are not a gun owner, there are a myriad of items either that you own or are readily available that you could use if you maybe "snap" at some point. The vast majorities of crimes are committed with items other than guns, including virtually every first world convenience item that you enjoy. Just because you don't care about someone else's possessions, rights, etc, be very careful to give their rights away because some day they might be coming for something that you value (like motorcycles for example - I'm just waiting for some "wacko" leftard/socialist/bleeding heart to be calling for more controls on motorcycles due to all of the recent deaths in the GTA)