

Some of the better RPGs allow you to play as an evil guy (equally fleshed out as the good guy playthrough), e.g. Baldur’s Gate 3 (it even has a special evil background storyline called The Dark Urge) or (some of?) the Mass Effect titles.
Cult of the Lamb is also a great game where you play a cult leader. Although the game’s design is strong on the entertaining/funny side, it’s kind of dark also.
Stellaris is a grand strategy game where you can play anything, from a ruthless ruler trying to destroy the whole galaxy to a pacifist trader.




Just throw it on the already existing mountain of evidence that he should spend the rest of his life behind bars.