It amazes me how people can make such illogical deductions as you do. But, the more time spent here, the less amazing it becomes. So let's see if we can't make a logical deduction from the facts we know. I do CC. You may reasonably deduce that I CC because I believe that I have a right of self-defense under applicable law in MA. If I believe that I have that right, it would be illogical for you do deduce that I would argue that others do not have that right.
As to where rights come from, that depends on your view of the law. I tend to think Kelsen had it right except that man is not the measure of all things in view of Godel's Theorem. So now you know my basic position on where rights come from.
That's a lot of words for saying nothing at all.
You CC, but you stated earlier certain people of certain mental mindsets (whether ill will, genetic defects, etc) should not be allowed to have firearms. Last I checked that's called deciding who is and who isn't allowed to CC. So you still haven't clarified that point, or told us in your own words what a right is. Instead you hide behind others opinions and claim them as your own, which is fairly disingenuous.