The underlying research is not definitely valid, because it was not performed on a representative sample.
We stress out about this a lot in my lab. Unfortunately we don't really have a way to get better samples.
We are still hardwired to have the same basic responces, even though they may be expressed in a different channel.
Maybe, but we don't know what is a product of hardwired responses, to what degree they are modified by the environment, and to what degree they are simply a product of environmental factors.
Don't substitute opinions for scientific fact. (Ironically, that's what this article is largely about - a plea for good research methods.)
Why wouldn't they be? Most people have to be concerned with a very similair set of problems (family, society, work, retirement). The social pressures might be different but not enough to invalidate decades of research.
Ah, but in fact, we find quite different experimental results in collectivist vs. individualist cultures. Some factors are universal, others are not.