To hit an innocent frail man is in itself such an iniquity, this person must be locked up for life, IMHO, if not death.
“I hit him a few times... It was stupid.”
That sort of thinking brings out the obvious perversity of his character, and will be sure trouble to many others, if left alone. It may not look too serious, but at an age like 91, even minor blows can cause organ failure, or oedema.
I append my earlier stance. Make that rigorous imprisonment, promptly followed by execution. These are maniacs demanding themselves to be made examples of.
Or, better yet, let the “suspect” be handed over to young 22 year old Marines to get some “learnin”