The facts as we more or less know them:
- young male, raised in conservative Mormon family in conservative Mormon area (around St. George, a pleasant retirment-oriented community)
- son of a local law enforcement officer. Brought up around guns and hunting, which is not at all unusual, particularly in this part of the country
- active on Discord. What forums, who knows. But likely involved in some fringe beliefs.
- engraved ammo with some political messages, one clearly anti-"fascist," others difficult to interpret (sarcasm? true belief? who knows)
Although he escaped, he seemed to know that he'd be caught. Wore the same clothes home. Confessed to family. Didn't want to go down in a blaze of glory.
The rest is pure speculation.