Two reasons can be as follow:
1) Desire to protect folk culture. People have an innate desire to protect and carry on their folk culture and adoption of new culture may interfere with that vision.
2) Fear of change or outside influences. People might have a fear that the outside culture will influence them in many undesirable ways which can prevent the adoption.
The Aryans (Vedic people) overthrew the stone forts of the Dasyu. If you refer to the Indus Valley Civilization people, no one conquered them, they left Sindh because of flood
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