Adele and list
I guess in truth I can only theorise as to the differences between the US and Australia when it comes to the attitude to whites.
My belief is that many breeders here are genuinely scared of melanoma (very malignant skin tumours for Eddies mom who asked earlier). We have the highest incidence of melanoma in the world, not only in humans but in dogs as well.
Some use that to hang on to.
Aussie breeders also use the deafness/blindness argument but further to that some Aussie breeders believe there is a link between white and aggression. I haven't heard that one out of the US to date and haven't seen it myself and find it very unlikely such a link exists.
Numbers would also play a part, there are FAR fewer boxer breeders in Australia and to date I'd say most are from the old school.
I also know for a fact that there are breeders in NSW NOT culling whites but saying they are publically to avoid being scorned by their peers. I know at least 4 breeders personally who do this. Not too strong of character IMO but then I don't give a hoot what people think like most seem to

Just go to any large pet store
(no names please) from time to time and see the white boxers in there being sold as "rare white boxers" and you can figure out that someone is keeping them.
Also bear in mind the fact that most of the news we get out of the US is from the Internet and there are FAR more US boxer people with access. We are still way behind when it comes to Internet Access per capita and as I said before we have far less breeders anyway so the story is not entirely as it seems.
I can tell you for a fact that the tide is turning with it, slowly. Most younger/newer breeders I know are not culling whites but by the same token you won't hear about them because they don't have websites etc.
Having said that and what has passed before I stick by my right to keep my whites, sell them on spay/neuter contracts and be excessively picky on where they go.
But I still can't find reason reason to berate breeders who cull when they believe it is for the best. It's like the Good Samaritan Act. You can't get in trouble for trying to help someone at the scene of an accident if you think you are doing what's best. Even if you are wrong, you are only trying to help. There is a correlation there if one chooses to see it
Matthew