In the 1800s, these Indo-Iranian "Kafir" polytheists of Afghanistan and Pakistan killed any Mohammedans who tried to enter their valleys and a young-man was expected to have killed a Mohammedan before he could marry.
This intense hatred of just Muslims seems to probably be a consequence of having to deal with repeated invasions of their homeland by different Islamic Empires in different centuries; Ghazni, Timur, Akbar all had attacked them unsuccessfully. They had beaten them back.
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