GT | Shooting at Trump rally shows 'rising political violence as US divides further', 14 July

usage: Means, motive, and opportunity are elements of a rubric to detect and validate or invalidate personal responsibility for an actual event, or fact.

(Not to be confuse with motif, or pattern; irrational-Eng. an emotion, or affect; pecuniary-Eng. (dis)incentive, or (punitive)award; stimulant; inducement; or "strategic strategy" unburdened by what has been crack-cocaine brand management: INFINITE CONTEXT WINDOW)

Even after the FBI cracked into Thomas Matthew Crooks' cellphone, scoured his computer, home and car, and interviewed more than 100 people, the mystery of why he opened fire aimed an automatic rifle to shoot Trump during Trump's rally Saturday, wounding the GOP nominee, remained as elusive [sic] as the moment it happened.
[...]
So far, there has been no public disclosure the shooter left any writings, suicide note, social media screed or any other indicator explaining his reasons for targeting aiming an automatic rifle to shoot Trump. A law enforcement official briefed on the ongoing investigation told The Associated Press on condition of anonymity that Crooks' phone had not immediately yielded any < wipes tears > meaningful clues related to motive [strategic? planed? premeditated?] murder or whether he acted alone or with others.