Look I know Perospero is considered one of the main antagonists (alongside most of the Big Mom Pirates) and yes he indirectly and/or directly is responsible for Pedro's death and he paid the price for it with his arm. Also he is a jerk but is really their revenge against him really all that justified? Because frankly, it all seemed to avenge Pedro against just one man of the entire Big Mom Pirates. It all just seem overkill and also just unbalanced.