Roz's Krantz & Gouldenstein are Dead - S4-E15
Continuity mistake: Frasier is on the couch talking to Niles. As he says "I simply release my humble words", his hand switches from being around the middle of his bottle of water to being around the neck, with no time for natural change.
Answer: While he hasn't gotten over it, he also took into account what the shooter's mother said. He refused to make a statement either for or against him. He can't forgive the shooter, but he's gotten past the anger.
Greg Dwyer