In my WIP the MC's father (who is an influential general) joins in a plot with the council to assassinate the current King. The kingdom has been at war with a nearby confederation of barbarians (sort of like the Gauls in Ancient Rome) for nearly a decade and have gained a foothold in the territory but at the cost of the lives of many soldiers (including the father's eldest son who was his best general) and townfolk who live on the border. The King hoping to focus on rebuilding from all the battle, wishes to withdraw from the barbarian territory and foster a ceasefire. The father however sees this move as a betrayal of everything he and the soldiers have fought and died for and he knows that it's only a matter of time before the barbarians just invade full force. He feels complete subjugation of the barbarian population is the only way to ensure a lasting peace for the kingdom. So he joins in the plot to assassinate the King. Is that a strong enough reason to kill a man he swore loyalty to and as a consequence put the king's family in danger as well? Or is it just an overreaction? I know historically speaking kings have been assassinated for less but I want to make the father at least somewhat sympathetic and not just another greedy, power-hungry despot, who just wants to be king for the sake of it.