gwern comments on The Amanda Knox Test: How an Hour on the Internet Beats a Year in the Courtroom - Less Wrong
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I rather think I did, since I wrote it.
It means that we're talking about an extreme part of the population.
My own reading of the bullet points in the post is something like this:
1) Group X is a small fraction of the population.
2) Reason A why group X is disproportionately unlikely to commit murder.
3) Reason B why group X is disproportionately unlikely to commit murder.
4) Reason C why group X is disproportionately unlikely to commit murder.
In the great-grandparent comment above you list an additional reason why pretty girls would be disproportionately unlikely to commit murder, but that wasn't clear at least to me from the original post. So, I agree with Douglas_Knight that bullet point 1 seems to serve a different purpose from points 2 through 4.