The problem with "putting responsibility on the person" is that more often than not these mass murderers commit suicide after they have killed innocent people. There is nothing wrong with combining restrictions on gun ownership for the mentally ill, and for people who want military style weapons that are unnecessary for hunting, target practice or defense of the home.
"Io sono stanco, sono imbigliato, and I wan't everyone here to know, there ain't gonna be no trouble from me..Don Corleone..Cicc' a port!"
"I stood in the courtroom like a fool."
"I am Constanza: Lord of the idiots."
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