Comments about ‘Chimney Rock declared national monument’

I really appreciate the efforts to save and protect these wonderful historic sites. But can I just ask one question? How do we know they wanted "to be near the sacred twin rock pinnacles." "They inhabited the region for more than 1,000 years but had left by 1300. Their disappearance is still a mystery." If we do not understand why they disappeared, then how do we know their religious beliefs? I think sometimes we superimpose our own emotions and feelings onto societies we have no clear understanding of. Could it be they just wanted to farm the land there?