I don't disagree with much of this, in theory. However, unwritten rule or not, Cave acknowledged it and apologized BEFORE Kepler even came to bat. So, if it were an unwritten rule, and it seemed it was, as Watkins seemed to be telling Cave that, and Cave had already taken responsibility for his 'grievous' behavior, that should have been the end of it. To then throw at the next batter after Cave already tipped his hat in compliance with said unwritten rule, was uncalled for. There was no reason, imo, to retaliate. Honestly, I don't like to see anyone being thrown at because a bad throw can truly injure a player, however, in this case, there seemed to be no reason for it even if you put stock in the unwritten rules.