The person who described the Derozians as the pioneers of the modern civilization of Bengal, the conscript fathers of our race whose virtues will excite veneration and whose failings will be treated with gentlest consideration is S.N. Banerjee.

Explanation:
The Derozians were a group of young intellectuals who emerged in the early 19th century in Bengal, India. They were the students of Hindu College, founded by David Hare, and were heavily influenced by their teacher Henry Louis Vivian Derozio. Derozio himself was a radical thinker and believed in questioning orthodoxies and promoting rationalism.

S.N. Banerjee, a prominent Indian nationalist and a contemporary of the Derozians, recognized their contributions to the modern civilization of Bengal. He considered them as pioneers who brought about significant changes in the social, cultural, and intellectual landscape of Bengal. Here are the reasons why S.N. Banerjee described them as such:

1. Promotion of Rationalism: The Derozians were known for their rationalist and scientific approach towards knowledge. They questioned traditional beliefs and superstitions and advocated for a more reasoned outlook. This emphasis on rationality and critical thinking played a crucial role in shaping the modern mindset of Bengal.

2. Social Reforms: The Derozians were actively involved in social reform movements. They fought against social evils like caste discrimination, sati (widow burning), and child marriage. Their progressive ideas and activism contributed to the social transformation of Bengal.

3. Literary and Cultural Renaissance: The Derozians were passionate about literature, poetry, and art. They encouraged creative expression and played a significant role in the Bengal Renaissance. Their literary works and intellectual pursuits added to the rich cultural heritage of Bengal.

4. Political Consciousness: The Derozians were politically conscious and believed in the ideals of liberty, equality, and justice. They were vocal about their opposition to British colonial rule and advocated for Indian nationalism. Their political activism laid the foundation for the future freedom struggle.

5. Influence on Future Generations: The Derozians inspired and influenced several generations of intellectuals and nationalists in Bengal. Their ideas and values continued to shape the intellectual discourse in Bengal for years to come.

In conclusion, S.N. Banerjee, recognizing the immense contributions and impact of the Derozians, described them as the pioneers of modern civilization in Bengal. Their rationalism, social reform initiatives, literary and cultural renaissance, political consciousness, and lasting influence on future generations make them deserving of such praise and veneration.