Because they literally don't

Indus valley is the precursor to modern Indus region ethnic group.
Sanskrit came from Central Asia, and developed in the Pashtun regions of Pakistan
Vedic religion originated the Indus region
The number zero also came from the Pashtun regions of Pakistan
The great army Alexander fought was in the north Punjab region of Pakistan
Buddhism only made it to East Asia because of the silk road and trade with Gandhara, also in Pakistan.


The Ganges region is literally known for two things.
The most disgusting holy river in existance where millions of dead bodies are dumped each year
Taj Mahal, which the Muslim built. Not the local Muslims, but the invading Persianised Turkic Muslims.


Naturally Pajeets can only cope by wewuzzing the Indus region.