I voted yes, mainly because I defend the idea that every citizen should start out with the same basic right to own the implements necessary to provide for his own self defense.
Obviously, there are people out there who lack the competence to be a responsible gun owner. Whether they have undocumented criminal tendencies, undiagnosed mental problems, or are just too stupid to be trusted with potentially dangerous machines, there are always going to be some of them out there wreaking havoc on polite society, with guns, automobles, kitchen appliances, workshop tools, or whatever.
The problem is that a country that guarantees individual freedoms always has a government that suffers from the same maladies as any other government, in any other country - corruption and incompetence. Mostly, the people who actually want positions of power, within the government, are the very people who should not have them, because they usually believe in their own superiority, and because they tend to have agendas that don't necessarily appeal to or benefit the majority.
What that means, relative to this subject, is that the people who we would naturally look to, to judge the competency of a citizen to have a gun, cannot be trusted to make honest and informed judgements, and can usually be counted on to make decisions that will do more to serve their personal agendas than to protect the individual freedoms of the people they purport to be representing. Most of them rise to such high positions through clever media skills and poll-watching expertise, rather than through any specific qualifications or experience that they possess. In other words, they are often wrong, or dishonest, in their assessments, because their first priority is furthering their own agendas.
So, in my opinion, every adult who wants a gun should be allowed to buy one, until such time as it can be shown, through his own actions or behavior, that he is a danger to others. Obviously, that means we are going to continue to have tragedies at the hands of these kinds of folks, as we always have. But no government can improve that situation without undermining the liberties of the majority, who have done nothing to disqualify themselves from gun ownership. That is just a sad fact that we have to live with and adapt to, if we are to keep our individual freedoms. We cannot trust political opportunists to make 'preventive' laws, because they rarely work, and because every potential human failing cannot be anticipated and prepared for.
You will never hear me say, "There ought to be a law..."