Yudhishtir, expresses his sorrow at not helping the Brahmins. So they walk out
They make the same demand, and Karna's soldiers tell him the same answer. Arjuna is elated, thinking that there is no difference between Karna and his own elder brother.
Arjuna accepts his defeat.
India, first and foremost, has to look after itself first, there is no doubt about it.
Because that is our ethos. Because that is what Karna taught us.