Short version; racist christian gun-enthusiast military intelligence analyst got pissed his gamer friends weren't interested in his write ups and commentary of classified intel he'd seen, so just started taking photos of it instead.
US has 1.25 million civilians with access to top secret docs, and not much competent due diligence. Who'd have thought something like this might happen?
Not to get all armchair psychologist about it but it seems like a really obvious patern doesn't it?
Man who is plausibly a relatively low level employee has a community where he is seen as a father figure. He then divulges classified information to improve his standing in his group.
Short version; racist christian gun-enthusiast military intelligence analyst got pissed his gamer friends weren't interested in his write ups and commentary of classified intel he'd seen, so just started taking photos of it instead.