Clearly OneSTDV was trying to encourage people to troll in that post. I don't see how much this differs from the "reader of the blog" hypothesis. Unless there are stylistic similarities in the way they write. As to opinions, reading through CaveJohnsons comments I agree with about 7/8ths, but you are right that there is a marked focus on HBD related issues in his posting history. The name he picked and a few of the earlier comments indicated he may have started out as a role-playing account.

If I had to bet I would say he is a DL of a LWer used for stating politically incorrect or dangerous opinions (ala Quirrell) who reads OneSTDV.

Edit: Googling the blog It seems OneSTDV thinks the drug war is eugenic while CaveJohnson wishes to relax drug laws.