Yeager, you're offering sweeping generalizations and platitudes.
You are absolutely right; no one thinks the mentally ill/insane should have firearms.
However, you are a little short on detail. Just how do you determine who is mentally ill and who is not? What standards will you use and how will you ensure that no systemic breakdown occurs.
As Mav said upthread:
If you are suggesting that any mental health treatment is a basis for branding someone as unfit, please tell us what the treatment level will be the trigger. Does divorce counseling do it? How about a mental health check prior to court assigning child custody?
Now that you are second guessing the system you need to propose what to do. What is the "rational and simple test"? Next, how do you intend to implement it, nationally?
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You haven't answered those questions nor made any suggestions.
Further, did you take a look at the link I posted to previous world-wide school shootings? Which, if any, of those perps was known to the authorities as mentally ill? Which of those mentally ill obtained their weapons legally? Lastly, how would your proposed system have prevented any of those?
Ripley, the way you just presented it ALL guns are just waiting the spur of the moment killing and ALL will eventually be used that way.
It's pure BS. Only a tiny, tiny fraction of the guns in the US are misused. But you knew that.
We've all been over these points dozens of times, to no end and to no purpose. No opinions will be changed here.