Something about this are that i find interesting is when Woltz is thinking about the situation. He "thinks" that his is unforgiveable, unecessary, unethical. That it is a "childish" reaction (this is the understanding I get anyway). What I find interesting is how he doesnt view how he acts, how he wields his power, flexes his muscle in the same vein. It is all from the same cloth. A powerful man using his power to get his means.

I for one, find his attitude and "revenge" against Johnny to be more childish than what Don Vito does to him and his horse.