The trouble with the proposed reporting/confiscation requirement, vis-à-vis the mentally ill, is that if such legislation doesn't also require, and fund, better access to treatment, it's not addressing the real problem. This law will affect those who have sought treatment, but it does nothing to make it easier for others to get help. (Or if it does, Spats hasn't delved that deeply...
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Taking away the guns of people who are already in treatment may prevent some violence, but it won't prevent it all, nor get at its causes.