Further to this post, see now also the letter from John Strawson round at Engage. He starts by identifying a central problem in the way JfJfP operates, using the weight - such as it is - of the JfJfP signatories to take up public positions that some (many?) of those signatories may not agree with, and that are not part of the organization's stated aims:
As a signatory I would like to know how this position on such an important issue appeared publicly without consultation with those [who] signed the original statement. I disagree profoundly with its contents and political line...Strawson goes on to make a number of other points. The force of some of these is so obvious that it's hard to understand how those responsible for 'On the Lebanon War' could have overlooked them. Read.