I think you are now the one making generalizations. You seem to use your brother as an example for the rest of the mentally ill and you are obviously ill informed.
Statistically my brother is the norm, not the exception, while your experiences are the exception and not the norm. You also are ignoring that your wife's position puts her in direct contact with that portion of mentally ill people who have committed crimes or have shown a propensity to.
Now, how many of those mentally ill people committed crimes while they were under the influence?
That, believe it or not, is a pretty important question.
My wife's company has over 1000 clients just in our COUNTY. Many of them are unstable, in/out of prison, etc even on medication. Some are violent but most are incapable of making day to day decisions or function in society without a personal caregiver. Sure, give them a gun.
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Nowhere did I or anybody else state that anyone who "is violent", "Incapable of making day to day decision or function in society", or "in/out of prison" should be "given a gun".
I am saying that if you haven't done any of those things, that a mental illness alone should not exclude you from exercising your 2a rights.
Obviously those who are "violent", "are in/out of prison", and "are incapable of making day to day decisions or function in society" are most likely restricted individuals anyways through their own criminal actions or mental incompetence, so that's a straw man argument from the beginning.
We are not talking about those people who have already DEMONSTRATED through criminal actions that they are violent and a threat to society, nor are we talking about those who are unfortunately too mentally incompetent and untreatable to be considered fit for society.