"The one true point he makes is that he has failed to extend his welcome to aboriginal people"

Codswallop.

""Australians had collectively failed to show to Aboriginal people the personal generosity and warmth of welcome that we have habitually extended to the stranger in our midst.”

 

He has said AUSTRALIANS collectively failed to show the same degree  of   generosity and warmth of welcome to Aboriginal people that they would to others (strangers) within the country (midst) i.e discrimination.

 

Meaning non indigenous Australians collectively,  not just him.

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