Why did Kunti not accept Karna?

Kunti is the mother of the Pandavas in the Mahabharata. She is the biological daughter of King Shurasena but is fostered in the court of Kuntibhoja. Her maiden name is Pritha.

As a young girl, Kunti gets a boon from Sage Durvasa that she can summon any god of her choice and have son with him. She can repeat the chant any number of times, and she can even share it with other people.

After the death of Pandu and Madri, Kunti becomes the primary binding force between the five brothers. She la...