Not me. Rather, Jared Diamond, a famous some-sort-of-scientist, wrote this article quite some time ago, that I just ran across.
Any discussion of the origins of the Japanese, he points out, is ideologically fraught in a way that the origins of most other cultures on Earth is not. Korea has similar problems. This is because Japanese and Korean cultural identities, as modern constructs, rely overmuch on pre-modern myths that still undergird modern nationalisms. Many Koreans will tell you with a straight face that Korea was "founded" in October 3rd, 2333 BC. If such a precise date seems implausible, well… they don't care.
Anyway, I found Diamond's article interesting reading.
[daily log: walking, 6.5 km]