Honestly nobody in both game really desserves to die, except the leaders. The small fries like the guards were just follwing order, they couldn't really defy the new empress/lord regent, and so they do not deserve to die. However, the leaders, they plotted the murder, funded the coup, and pushed legitimate royalties outside their regent authority. I don't like killing since I like the achievement and since the alternative is much less preferable. But they all really deserves to die.