I noticed that Batman went for the petty criminals, and about the most prestigious one was the main hitman Jack Napier. Everyone in Gotham knew Grissom was the core of the problem, so it wasn't a mystery. Batman was definitely a fine detective in this movie, so finding the crime boss's whereabouts would'nt have been a challenge. Yet he never targeted and pursued Grissom on an individual basis. I thought that was strange.