On one hand, there are “lone wolf” jihadists living here and there throughout the world, including the US. On the other hand, untold millions of guns of all kinds are freely available to anyone with the money to buy them. Now you cannot necessarily tell a jihadist or a mental case, for that matter, just by looking at them, but you can easily spot an AK-47, and as long as we live with these two conditions, we are going to experience tragedies right here at home. We cannot eliminate the jihadists or the mental cases, but we could outlaw the murder weapons if only we had the will to do so.