Later edit: This is speculation on my part from limited knowledge.
It was mostly half caste Aboriginal children, that is ones with white blood, who were removed from their families. The full bloods were left alone with the hope by some that the race would die out. Generally the children's bellies were filled daily and were cared for by their family and more importantly normally a huge extended family who would ameliorate the behaviour of family members who has taken up bad white man habits. They may or may not have received a traditional white education but would have learnt Aboriginal ways and survived as their ancestors did in this land we call Australia for over 400,000 years. Aboriginal kids always had an auntie to go to, who would be firm, fair, just, caring and loving.
That's my theory, anyway.