So, given that this guy's rights to possess firearms were revoked, and he acquired firearms from a person who had the legal right to possess firearms (his father), what is the logical conclusion re firearms rights?
No one should be allowed to possess firearms, because either the legal possessor can "go crazy" (the vegan google/youtube attempted murderer, etc.) or some other crazy person can steal them and hurt people. The one, and only, logical solution is to ban firearms totally, perhaps even from agents of the state, as some of them have been known to engage in criminal activity.
Ladies and gentlemen, welcome to Venezuela/Mexico/Cuba, the dream state of all right-thinking people.