I would be careful imputing too much superiority to myself over Russel, Sagan and/or Kerry purely on the basis of thinking JFK was lone-assasinated.

Yes, of course. Russell & Sagan's intellectual achievements tower over mine, whether or not they called the JFK assassination wrongly.

Just as one might consider a predilection towards conspiracies a bias, I think I came in to that job with a bias AGAINST conspiracies.

That's a real bias too, I reckon. I think of it sometimes when I see someone putting too much weight on a weak anti-conspiracy theory heuristic.