Okay, my reason is as follows:
"To fulfill the requirements of citizenship in a free society, to stand ready to resist the onset of tyranny, the illegitimate interference of government in the exercise of my fundamental rights, and to defend my family and society from violence perpetrated by either a criminal element or the denizens of despotic rule."
Think I'd get a licence?
But that is THE most legitimate reason to own firearms.
Are there hordes knowkicng at yor door?
If the government interferes illegitimately, instead of blowing a burocrat's head off, how about taking him to court?
Now the last one about defending your family, I think that would be a reasonable one, but then the weapon should match your claims. A pistol, maybe a rifle, not a machine gun.
Honestly, I don't know where to draw the line exactly, but think it reasonable that the government could ask why you think you need a weapon. Again, as to who shuld qualify, I'd make it broad, including hunting, sports, etc.