Know it's a common trope to let the villian monologue, but can't help but feel pity for the poor castle. It didn't deserve the wonton demolition just because the prime minister was such a douche...
Just behead the dud and be done with it. Not like such an individual with such a weak character is worth listening too. Better just to let the abused niece take her revenge and move onto the puppet master that's pulling this creeps strings.