The simple (and all too simplistic) answer is that anyone who cannot be trusted with a firearm, whatever the cause, be it criminal behavior or mental defect, should not be running around loose. But confining them all is too costly.
On the other hand, having everyone who desires it armed and trained makes it likely that the damage inflicted by the miscreants will be minimized by those around them.
Well..they are running around loose and it is illegal for them to own a firearm.
And I was not talking about confining them. If you knew anything at all about the SMI, you would realize that there are several levels.
But then again, you couldnt understand, since you need to understand the simple answer.
And yes, if it was required that ALL LEGAL citizens of the country were armed..you wont get any argument from me on that point.