> Archaeologists have long tended to choose the second option
One of the many reasons archaeology frustrates me. If you can't figure out why somebody built something in the past, its always for ritual reasons, rather than more mundane reasons.
For example, I went to Chichen-Itza last week. If something happened, and all the street vendors' stalls were abandoned, it's almost certain that archaeologists of a thousands years in the future would conclude that it was a major religious pilgrimage site, of a culture obsessed with miniature pyramids, obsidian miniatures, marble chess sets, and brightly glazed ceramic skulls. What they would make of the multitude of ceramic phallic hash pipes, I'm not sure I want to speculate about...