He was a nut...a loan nut.
A fantasist seeking notoriety. Couldn't obviously achieve fame or fortune (he was an order filler in a warehouse) through his own limited talents. The only way was an act of insanity. That's about the size of it.Fair enough you can add a psychological profile, a psychiatrist assessment, all the psychobabble you want..the guy was a nut.
That other idiot Ruby put the skids under Oswald and presented hundreds if not thousands with a "cause"...and in some cases..a living.