They disregard them by comparing one black slave to only 3/5 of a human. it demoralized them bc liberty means freedom but they were slaves, equality is automatically thrown out bc they are only 3/5 of a white man. and self governing is no bc they were forced to do things such as cultivating cotton without their own consent per se
there are many reasons why they did not want to give up their land. For one, their land was habitable and they had been there for many years so they did not want to leave. Two, they were being forced out of their land whether they agreed to or not. Plus, each Native American tribe had their own land that was theirs and by moving to a new place, they would be forced into someone else's land.
I hope this helps :3