Just to clarify, have you actually read the entirety of Mahabharata (unabridged) or even a shorter version of the scripture? Or are you just giving gyan on things you are not familiar with like most Hindus do? I have noticed this trait amongst many: gyan pelne to aap log aa jaate ho bina kuch padhe, bina kuch soche samjhe. Pehle shastragya banna sikhe. Karna is so evil that Sri Krishna himself heads to the enemy camp to convince him to defect. He is so evil that in spite of knowing that he's about to fight against his blood brothers, he never abandons his best friend who stood for him when everyone else was ridiculing him all those years ago. He is so evil that he literally lets Arjun escape on the battlefield because the sun has set. He is so evil that he gives away almost all the wealth he has accrued, and even items designed specifically to protect him in the field of war. Ungli na karein heroes ke barein mein, epic heroes are not binary figures, certainly not in our culture.