This factor as much as anything makes boards such as this less valuable than they otherwise might be. Irving Janis studied this phenomenon and coined the term groupthink, with respect to the Bay of Pigs Invasion, as well as other situations were bad decisions were made at least in part as a result of group dynamics.
http://en.wikipedia.org/wiki/Groupthink
Note the conditions conducive to groupthink, and check them against the conditions that pertain to internet special interest discussion boards such as this one. Pretty good fit, IMO.
I notice that the overall tone of confidence in this recent thread (regarding SWR, etc.) is lower than in earlier threads. People have actually mentioned 2% SWRs, and not been shouted down. I would expect that future negative events in the economy or markets could cause further shifts in the tone here, and that these shifts will happen more or less "en masse".
There is irony in this particular thread. On this board we have a doughty group of independent-minded free thinkers, capable of evaluating evidence and striking out happily on their own, shunning and frequently denigrating professional advice. Then one person, Bernstein, says "Hey, I don't think too much of this 4% SWR and very young ER." Look at how many posts this thread has drawn. Did Dimson’s book or paper get much comment? (No) So it looks to me like people are looking to Bernstein as their guru, to lessen anxiety in an area that is naturally anxiety provoking. It is as if the Majarishi came out and said, "Well, I didn’t think this yogi meditation crap through very well, maybe it doesn’t do much after all."
Bernstein writes about something that he prefers to avoid himself(ER). What he really did is transit from a pretty good job, neurologist, to a really good job, money manager/guru. And one who has defined himself as keeper of the high bar.
Now as his revised opinion sinks in around here, it evidently causes some amount of anxiety. And it should. What other parts of the dogma will be renounced?
People here ask questions about market history that are clearly answered in links on this board, as well as papers referenced in this very thread. To me it sounds a little like asking your buddy what color something is. Wouldn't it usually be better to look at the object for as long as necessary to form one's own opinion?
Ha