There have been seven shootings at auto plants and two at post offices in that state alone since 1991. After each such shooting the American media reassure themselves and the public that the person responsible and the incident itself are individual cases, isolated and inexplicable. Very little light has been shed on the circumstances that produce such incidents. But giving something a name is not an explanation. There are different sides to this question.
Emotional collapse is a complex matter.
Many factors may drive someone to an irrational act. But in the case of the Capitol shooting we are confronted with the confluence of emotional collapse and social processes. Weston opened fire in the seat of the US government, after a morning apparently spent ranting about the president in a park across the street from the White House. His mental breakdown thus became a public act. There seems little question that Weston suffered from a serious psychosis, including paranoid delusions.