As with all historical documents, you have to consider the context. I don't like that kind of language either, but from the perspective of those writing/signing it, some of whom had probably seen/lived through/faught in attacks by Native Americans, without the support of the Britich government, it probably seemed a valid statement. On the other side of things, the US Government and the colonists did some pretty horrid things to the Native Americans as well... I imagine that if the Native Americans had written a similar document for some reason, it would have mentioned the lying, honorless, thieving white man.
