I've been saying this for years. As a Psychological Operations Specialist in the Army, I've learned just how easy it is for a psychologist to brand someone "crazy". And exactly how hard it is to get that label lifted once you have it.
There is just so much we don't know about the workings of the mind, and while we've learned to manipulate certain aspects of it (marketing in its purest form is psychology) we've granted a great deal of power to those who claim to have any understanding of this process.
And the truth is, unless you are talking about physiological imbalances (and even there you have to read carefully), its more magic than science. Diagnosis are often very subjective, influenced, and weighted by the personal bias of the psychologist.
To an anti-gun psychologist, any desire to own a gun is a sign of mental illness, or at least subjectively so. Why do you want a gun? Fear? You are paraniod. Paranioa builds until you lash out, therefore you are the last person that should own a gun.
"Blessed be the LORD, my rock, Who trains my hands for war, And my fingers for battle;" Psalm 144:1-2
“Let him who has no gun sell his robe and buy one” Gospel According to SGT Kane 22:36