I gather he has issues with depression. That's a chemical imbalance. It's not his fault.
He has difficulty admitting or accepting this, which is why he gets angry at similarly situated individuals, e.g., people who are susceptible to drug addiction. He sees himself in these individuals, reflected back in a kind of grotesque funhouse mirror. Something analogous to a puritanical instinct (think of the puritan's fear and hatred of the adulterer) drives his contempt for these dangerous others - dangerous because they represent what he might become were he to allow his self-control to slip, even for a moment.
Fundamentally, this outward-directed anger is an expression of self-hatred -- hating in others what he hates in himself. Self-loathing is, after all, the essence, the core dynamic underlying depression.
But that is only one facet of the anger, another being his view - as one who has achieved a hard-fought balance in life through a certain radical honesty and self-discipline - of those who have failed in life through a lack of honesty or discipline. This is something like the wealthy, self-made man's contempt for the poor.
And, too, there is simple, garden variety
lulz at work here, as well. But such feelings are, obviously, not far removed from self-hatred and contempt.
Fascination with imagery of the kind you describe undoubtedly reflects self-destructive impulses - contemplation of such images provides a certain, peculiar relief.
On the one hand, sending you such an image touches a dark chord of humor/anger; provoking a response from you makes that chord resound even more satisfyingly (on the internet, attention is the currency). On the other, it is difficult not to think of Van Gogh sending the "gift" of his bloody, severed ear - a radical gesture of love in Van Gogh's case, and
lulz in the case of G's virtual gift.
You seem to be fairly compassionate regarding some matters, Vince. You should take a step back from the situation, and see if you can find some compassion for G. G himself is not lacking in compassion, or a strong ethical compass that prevents his inner darkness from ripening into true sociopathy. But the rigidity of his views - not unrelated, perhaps, to his work as a computer programmer - cabins that compassion to a certain narrow range of "worthy" subjects. Contrariwise, those who fall outside that narrow range are potential targets of his scathing anger, which in turn provides relief/escape from his depressive feelings - although the relief is only temporary, as it does not address the core underlying problem. But in that it provides
some relief, that particular well is returned to again and again -- an addictive cycle at the psychological/emotional level.
Just my 2 cents.
TFO