#1 reason to kill Letho
He admittingly has turned his back to the Witcher's path. The Emperor has promised to rebuild the school of the Viper for him. No doubt, the Emperor plans to create an army of Witcher warriors with Letho as their general. King Henselt made a comment that if he had several more people like Geralt he could conquer more lands. Letho has no noble plan in mind for rebuilding his Viper school. He has no interest in the Witcher life anymore. He is more than happy to become a killer of human, elf or dwarf, whatever the Emperor wants. For this reason alone, Letho must die.
He admittingly has turned his back to the Witcher's path. The Emperor has promised to rebuild the school of the Viper for him. No doubt, the Emperor plans to create an army of Witcher warriors with Letho as their general. King Henselt made a comment that if he had several more people like Geralt he could conquer more lands. Letho has no noble plan in mind for rebuilding his Viper school. He has no interest in the Witcher life anymore. He is more than happy to become a killer of human, elf or dwarf, whatever the Emperor wants. For this reason alone, Letho must die.