And let's not forget the most rampant bias in Wikipedia, one that affects all of the language Wikipedias, namely the belief that it is worthwhile to present all sides of an issue.
Which is to say that the neutral perspective is itself a bias. As the NPOV policy is pretty explicit about.
I'm pretty willing to accept the fact that there is no way to write without writing to some cultural context. We cannot simply imagine a culturally unbiased perspective and then write from it. This systemic bias, real as it may be, is unavoidable. As such, I am unable to seriously consider it a problem.
-Snowspinner