He who does not protect morality when it is being disregarded, is himself a trespasser of the same. The Kauravas transgressed morality. They have with their followers been killed by you.
धर्म विनश्यमानं हि यो न रक्षेत् स धर्महा। ते त्वया धर्महन्तारो निहताः सपदानुगाः॥