Krishna didn't promise to kill Karna?😆
"Vaisampayana continued, 'In that assembly of heroes Vasudeva then spake unto the weeping Draupadi as follows, 'O fair lady, the wives of those with whom thou art angry, shall weep even like thee, beholding their husbands dead on the ground, weltering in blood and their bodies covered with the arrows of Vivatsu! Weep not, lady, for I will exert to the utmost of my powers for the sons of Pandu! I promise thou shalt (once more) be the queen of kings! The heavens might fall, or the Himavat might split, the earth might be rent, or the waters of the ocean might dry up, but my words shall never be futile!'
Stop thy tears, I swear to thee, O Krishna, soon wilt thou see thy husbands, with their enemies slain, and with prosperity crowning them.'"
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Re: Your Yudhishtira comparison. Nuh huh. Vyasa asked the Pandavas to go to the swayamvara to win her as wife. I think it was 100% wrong, but Arjuna had already won her, and HE actually asked Yudhishtira to decide.
Krishna, OTOH, had absolutely no legal standing to make that offer. He wasn't her father, brother, husband, or fiance. Moreover, she had already told him she wouldn't listen to him.
(Same link as above).
Lotus-eyed one that art anxious for peace with the enemy, thou shouldst, in all thy acts, call to thy mind these tresses of mine seized by Dussasana's rude hands! If Bhima and Arjuna, O Krishna, have become so low as to long for peace, my aged father then with his war like sons will avenge for me in battle. My five sons also that are endued with great energy, with Abhimanyu, O slayer of Madhu, at their head, will fight with the Kauravas. What peace can this heart of mine know unless I behold Dussasana's dark arm severed from his trunk and pulverised to atoms?