I too am an outsider to the people of Sindu. If they insist on calling me Gangadeshi, I will call them Hindustani. At least one of us will be accurate.
Hindustan is derived from the word Indus. So if you call us Gangadeshi, you become Hindustani. Nothing to do with the religion. It has to do with geography.
As far as the Balochistan insurgency goes, a strong insurgency will blow up in Sistan and Iran does not want that. So it is actually very critical for Iran not to support any insurgency in Balochistan.
The TTP are hardcore sunni and the Iranians don't like that. So again they would not be...