> Why is it so hard for some people of European descent to believe that non-European people may have crossed oceans in non-European ways, without Europeans ever hearing about it? For goodness sake, look at the pyramids. European people still aren't totally sure how those things were built. There are theories, but you don't know what's possible/impossible.

Well, saying that Norte Chico gave the Ancient Egyptians a hand with skycrane techniques is pretty impossible. There's a wide gap between "we're not sure what the answer is" and "this wild theory is equally well-supported by the evidence."

I gave some details in another comment, but the shipbuilding technology simply didn't exist before around 700 or so to cross the Atlantic Ocean--not in Europe, nor in the Americas (It did exist in Asia, but the Polynesian expansion and experience strongly limits the space for Asian trans-Pacific contact). That creates a very strong prior against pre-Columbian trans-oceanic contact, one that requires more persuasive evidence than "I can interpret this as a New World relic in the Old World." The only theory that comes close to meeting that standard is the Polynesian contact theory.