I disagree. The only people who will think like this are liberals, and who gives a fuck what they think? Libs gonna lib, as they always have. Left-wingers (some of them, at least - I assume there were some who thought differently) have always been critical of colonialism and imperialism - Marx wrote scathingly about atrocities committed by the British against the Chinese and Engles had some thoughts about the English occupation of Ireland, for example. If it seems as though no-one cared about the Aboriginal Australians or the First Nations people, it was very likely because not as much was known about them; there were only so many socialist thinkers at the time, and they were probably more preoccupied by potential revolutions going on closer to home.

However, the surviving indigenous peoples of America and Australia certainly won't forget what happened to them, or what is still happening to them. The palestinians have the support not just of white European and American leftists like myself, but broadly of the Muslim diaspora community on those continents and the people of the Islamic nations surrounding Palestine. I know I certainly won't forget what Israel has done, nor will I ever think it was justified. And what happens when Uncle Sam finds it inconvenient or impossible to stand up for Israel anymore? I don't know for sure, but it will probably involve a lot more killing.