You say "theft is theft, regardless of who you thieve from"
So by analogy, I guess if you are knowingly using a stolen TV, you are an accessory to the crime?
Therefore, by deduction, then you are guilty of aiding and abetting the crime by living here on stolen land - unless you are of Australian Aboriginal descent, based on what you are arguing, you have no right to be living where you do - this is all Aboriginal land. By living where you do, you are condoning the actions of those you regularly claim here are the usurpers...
...or, are you saying that by morally continuing to slam those from 226 years ago (and their ancestors) who first settled here, you are therefore immune and morally acquitted from any wrongdoing and you therefore have a right to live where you do.
Most would classify this as a copout stand of utter hypocrisy.