Karna takes part with the Danavas and he deserves to be defeated so the intentions of the gods will be fulfilled. One should always he careful about his business
कर्णश्च दानवः पक्ष अतः कार्यः पराजयः॥ एवं कृते भवेत् कार्य देवानामेव निश्चितम्। आत्मकार्यं च सर्वेषां गरीयस्त्रिदशेश्वर॥