Nikon's silence on the D600 dust 'issue' and any others is more than a show of corporate culture it is a reflection of Japanese culture as a whole - I think.
I say 'I think' because I believe it's very hard to fully appreciate a different culture no matter how long one may live or visit amongst one. So I'm not sure any other than the Japanese themselves have a full appreciation of why there is such a complete wall of silence surrounding product problems - look at the recent history of Fukishima as an example.
Contrast Nikon to Apple. Here we have well known personalities front stage launching new products, discussing challenges and innovation in the media. CEOs who are household names.
As a user of their respective products I find the allure comes from very different aspects - with Nikon it is in part because of the mystic of their image - there's something robust and enduring about Nikon's almost cult-like shroud, with Apple it's partly about the trust. Overall, of course, a mixed bag.