In trying to decide who is guilty of a murder, investigators look for three factors that converge on the culprit: motive (a reason why the murder was committed), opportunity (the killer had to be in the place and time to carry out the plan and not have an alibi), and means (the killer needs to have access to whatever method was used for the murder). In the case of these mass murders in the US, the motives range all over the place including but not limited to racism, jealousy, anger, frustration, seeking fame, and mental breakdown. Opportunities are also plentiful, especially if you do not care about getting caught and your targets are not specific individuals. You can just wander into a mall, cinema, school, or anywhere large numbers of unsuspecting people are gathered.
But when it comes to means, a single common factor immediately jumps out and that is that these mass murders are possible because the killers had access to a powerful, military-grade assault weapons that enable the killing of large numbers of people in a very short time, so that however quickly the so-called ‘good guys with guns’ respond, it will not be quick enough to prevent a large number of casualties. We saw this in the two recent shootings where armed security were actually around and yet could not prevent the carnage.
Evidence for means as the main factor responsible for these tragedies is plentifully available. In the most recent case in Texas, the gunman legally purchased two rifles and 375 rounds of ammunition just last week, just days after his 18th birthday.
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