Schlesinger is similar to Sorenson above
He was advisor of Latin Affairs to JFK (So if critical of JFK in B of P and Missile crisis he would be critical of himself and the role he played) Liberal tradition
He released his history a year after JFK died, people where not ready to be critical of his actions and role
Find the preface of his book it raveals much about his Aim/purpose, methodology and Context.
He did not write a "history", he wrote done the "facts" so it may be use to hisotrians in the future (Actually says that in preface)
He does not include references or footnotes - context - people involeved and still alive
His aim is to celebrate, to show a great pres that got cut done before his time.
Does not deal with womanising and little with health. The only bit he does demonstate is that is made him a better pres out of the experince - not negative as Hersh does it.
Dallek gives a balanced view. By the time of publication, 2003, both extreme views had been done, he wants, and the public to know, the real man. Has huge access to wide range of sources (pres tapes, soviet etc) It is this new evidence is why he wrote the history as he thinks it will give a more balanced view on him. He does not want to write another debunking book but a solid historical work (Extensive and exhasutive research conducted - no heresay or Might have beens as Hersh) Has hisroy teacher conext and written many books on other preses (Nixon, Truman etc) and thus does not place undue weight on things he does not understand.
There is a alot more but that is all I can think of off the top of my head at the moment. Hope that helps. I think I might go and study this now lol