More archaeological nonsense

Continuing the series of "angry old man" posts about foolishness. How about this (from here):

Humans domesticated the sweet potato in the Peruvian highlands about 8000 years ago, and previous generations of scholars believed that Spanish and Portuguese explorers introduced the crop to Southeast Asia and the Pacific beginning in the 16th century. But in recent years, archaeologists and linguists have accumulated evidence supporting another hypothesis: Premodern Polynesian sailors navigated their sophisticated ships all the way to the west coast of South America and brought the sweet potato back home with them.

Once again American's native population is assumed too dumb to go sailing. So the Polynesians must have done the round trip. Also it is as if they never hear about Kon Tiki.