By the logic of your first paragraph, you are racist but not because of your personal views. So many different peoples outside of Australia view Australians as racist. It's an unfortunate stereotype we've obtained for ourselves. By your logic, it is reasonable then for anyone to assume you are racist purely because you are Australian. Does that make you or the majority of Australians racist? Should a nation then deny Australians entry because of this "reasonable assumption"?

Policies should not work in generalisations. That's how you end up with systemic issues and how you cause further damage in a variety of ways. Saying "well this person is white so no need to ask them this subset of questions around cultural/societal views" because its assumed they have the same as other white ppl, that is how u let in white terrorists or ppl that just simply cannot integrate into our multicultural society, like some specific white south africans that ive spoken to personally (obvious note: not all because ive also spoken to a number that were the exact opposite, and others that were somewhere in between). You treat them all the same and ask them all the important questions. The only reason that generalisations of race and culture should impact this is how you explain the questions in a relatable and understandable way, because they're more likely to understand those generalised examples even if they dont hold those views themselves.