Sir, your post about the forgotten contribution of the Parsi community during the WWI has hit a different chord with me and I would like to add more towards the credit of the Parsi community's contributions, for the knowledge of our younger generation.
I lived in Karachi between 1948 and 1967 and I have witnessed a different Karachi than what it is today.
Parsi, Christian and Hindu communities have played a significant civic role in the development of the City of Karachi before 1947.
Non-Muslim, i.e., Hindus, Parsis, and Christians were the original owners of Karachi. They developed the city by setting up hospitals, schools and parks. The Parsi community in Karachi has always been small, but it has gifted an unmistakable legacy to the city. They have left their mark on the metropolis with their contributions ranging from education to healthcare. They have built formidable establishments such as:
Mama Parsi Girls Secondary School, BVS Parsi School, NED Engineering University, Lady Dufferin Hospital, Spencer Eye Hospital, The Goolbai Maternity Homes, and the Dinshaw Dispensary, not to mention The Metropole and Avari Hotels.
Pakistan was created to provide economic parity to the Muslims of the sub-continent which would not have been possible living in India. Mullas later hijacked Pakistan under the guise of the "Islamic Republic of Pakistan”, during the dictatorship of Gen Zia.
When Pakistan was created in 1947, the percentage of non-Muslims, i.e., Hindus, Sikhs, Christians and Parsis was 25%. Bad politics has caused much of the minorities to emigrate and reduced the non-Muslim population to a much smaller number.
Dishonest and coward historians have always discriminated against the minorities by skillfully hiding or ignoring their achievements.
Living in Karachi as a member of the Parsi minority, you should know the answer to your question and understand the reasons behind it.