Solution

Reasons for keeping India secular:
1. All the Muslims did not leave India during participation, some muslims stayed in India as a minority and Jawaharlal Nehru wanted to deal with them in a very civilised and dignified manner.
2. He advocated security and democratic rights of Muslims as a citizen of India.

No, these reasons were not only ethical and sentimental, but there were some prudential reasons also as:
1. India’s secular nature cherished its long term goals and principles like socialism, equality, liberty and fraternity.
2. Secularism stops any single faith to become superior and inferior to those who practicised another religion. Hence it considers all citizens equal irrespective of religious affiliation.