Batman's magic pointy ears assure that none of his victims die, even through IRL such a street-fighter would have a long body count just from the sheer numbers, including a few from his Rogues Gallery.

Moreover, the magic pointy ears assure that any traumatic lifelong injuries (including TBAs from concussions) fade from public awareness and Bruce's memory, so he can sleep well at night forgetting those who failed to fully recover.