Yes, I suppose you’re right. In the end, we’re all immigrants; humans have moved everywhere across the earth since the beginning of humanity, and having moved definitely does not make you worth less as a person in the first place.

However, humans are social creatures and desire social and cultural belonging, and someone coming and forcibly taking everything that over many years has become associated with this culture away from them and replacing it with their own is very unjust. The above are certainly ways in which the settlers try to justify this, and with this in mind they are certainly invalid. But I do agree that it may not be as simple as they make it look.