[RhysU]

Well put.

"Why" is completely irrelevant to this thread.

Returning to where this all started...

> If you assume all groups are on average equal but certain groups are underrepresented you must assume that the selection process is flawed.

Since groups can differ in meaningful ways, for any number of reasons, no conclusion can be made about whether the selection process is flawed. At least not in the ancestor post's framework. The assumption does not hold.