Why did Rabindranath Tagore write knighthood?

Rabindranath Tagore renounced his knighthood in 1919 after the Jallianwala Bagh massacre in Amritsar, India, as a form of protest against British colonial rule and the violent actions of the British government in India. Tagore felt that he could not hold onto a title bestowed by a government responsible for such atrocities.