This duties of a Kshatriya are high, cruel, shorn of all considerations and feelings of pity. Otherwise, how could you kill Abhimanyu under those circumstances.
क्षत्रधर्मं भृशं क्रूरं निरपेक्षं सुनिघृणम्। अन्यथा तु कथं हन्युरभिमन्यु तथागतम्॥