Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 47


कोपस्तेऽखिलशिक्षार्थं न द्वेषान्न च मत्सरात् ।बिभ्रतो भगवन् सत्त्वं स्थितिपालनतत्पर: ॥ ४७ ॥


kopas te ’khila-śikṣārthaṁna dveṣān na ca matsarātbibhrato bhagavan sattvaṁsthiti-pālana-tatparaḥ


Your anger is meant for instructing everyone; it is not a manifestation of hatred or envy. O Supreme Lord, You sustain the pure mode of goodness, and You become angry only to maintain and protect this world.


The Kurus admit that Lord Balarāma’s anger was entirely appropriate and in fact was meant for their benefit. As Śrīla Viśvanātha Cakravartī puts it, the Kurus meant to say, “Because You exhibited this anger, we have now become civilized, whereas previously we were wicked and could not see You, blinded as we were by pride.”