The video has recently resurfaced on social media, with the release of Bryan Singer's X-Men: Days of Future Past.
In a brilliant move, a promotional website as well as a video report chronicles Magneto's part in the conspiracy. The extremely well done marketing strategy, blends the real world with the fictional universe of the X-Men, and re-writes history. The video explains the premise by which the mutants are added into the conspiracy, but the website gives you an in depth look into the whole case, giving you different points of view, witness statements and news reports by media. The website also shows a great time-line through a video, explaining the series of events.
According to the fictional story, Erik Lehnsherr (Magneto), was arrested and convicted of killing JFK and is being locked away in a deep underground prison, which begins the action of the film. The Bent Bullet actually acts as a cover up website, that explains that Lee Harvey Oswald was working on Magneto's orders when he took the shots. Magneto, then, was positioned down on the grassy knoll, where he was photographed by a witness and other pieces of evidence that insinuate Magneto had a premeditated plan to murder the president.
According to the story, Magneto bends one of the bullets to ensure it hits the president.
All inputs via The Bent Bullet