Why Not Retaliate Against Krishna Directly

“O sober Vidura, King Indra, his honor having been insulted, poured water incessantly on Vrindavana, and thus the inhabitants of Vraja, the land of cows, were greatly distressed. But the compassionate Lord Krishna saved them from danger with His pastime umbrella, the Govardhana Hill.” (Shrimad Bhagavatam, 3.2.33)