I love Chakotay's speech to the Voth Ministry of Elders from "Distant Origin" about how re-writing history denies the achievements of those who went before us:
"I see something very different, Minister. An ancient race of Saurians, probably the first intelligent life on Earth, surrounded by some of the most terrifying creatures that ever lived. And yet they thrived, developed language and culture and technology. And when the planet was threatened with disaster, they boldly launched themselves into space, crossed what must have seemed like unimaginable distances, facing the unknown every day. But somehow they stayed together, kept going, with the same courage that had served them before, until they reached this quadrant, where they laid the foundation of what has become the great Voth culture. Deny that past, and you deny the struggles and achievements of your ancestors. Deny your origins on Earth, and you deny your true heritage."