The carnage that has overtaken the Kurus was not caused by Duryodhana. It was not brought about by you. Nor was it brought about by Karna and Subala's son.
न तद् दुर्योधनकृतं न च तद् भवता कृतम्॥ न कर्णसौबलाभ्यां च कुरवो यत् क्षयं गताः।