"…prehistory and archeology have inevitably developed in an intensely political context. Nationalism has never been far beneath the surface. Immense efforts have been made to discover a past to which modern people could relate, and, where necessary, to exclude those elements of the past that were politically inconvenient. Prussian archeologists would prove beyond question that the prehistoric monuments of Prussia's eastern borderlands were indisputably Germanic. A few decades later Polish archeologists working with identical material established that the selfsame monuments were indisputably, and ab origine, Slavonic. Neither side paused to ask whether those monuments were not, at least part, Celtic." –Norman Davies, The Isles: A History, p. 40, New York: Oxford University Press, 1999.
The quote deals more with politics (as in, being able to hold claim to the land and being able to claim to be native to the land (see more about the Israel-Palestine conflict for a prime example)) but it helps illustrate how some people can just be ridiculous and choose to ignore important viewpoints or facts. Sometimes outside eyes are needed to see clearly.