I somehow missed this piece by Peter Mandler in The Higher last week. It's interesting, although I do sincerely hope that the title was not of Mandler's devising. It would suggest a grasp of the English language unbecoming a Cambridge professor of modern cultural history. I don't find much in this piece about why the Haldane principle is there. It seems more to be asking where the Haldane principle has gone, suggesting the common misunderstanding of Juliet's impassioned cry. Modern cultural, I suppose...
Be all that as it may, here is a less-than-entirely-convincing response to Mandler's piece, which still seems to dodge the key points made by Mandler and others.
Finally, here is Laurie Taylor's take on the situation (scroll down to 'There's no conspiracy'), which sums it all up...