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Given what Tolkien wrote later about "evil temple", maybe he wanted to show that these Men had been engaged in worship of Sauron/Morgoth and that it was this that led them astray and made them break their oaths
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It is stated in The passing of the grey company that they did serve Sauron:
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But when Sauron returned and grew in might again, Isildur summoned the Men of the Mountains to fulfil their oath, and they would not: for they had worshipped Sauron in the Dark Years.
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