Lucca The "fists clenched" posts was by a "body language" expert" who had deduced that William was stressed at having to walk with Harry. By reading it to see what he was on about, I also read in the comments one by an ex-forces guy, who pointed out that when soldiers are walking at a funeral, as these men were, they are trained not to swing their arms briskly about, but to let them hang loosely by their side, hands closed and thumbs to the front - as all the half-a-dozen men in the photo were doing. The ones I recognised were all ex-forces, even Edward was long enough in the Marines to get some basic marching training.
Reading the comments as well as the headline meant I knew WHY I shouldn't trust the person who had rushed to put in his two-penn'orth of amateur psychology. Facebook contains a lot of rubbish, but also some sensible people who try to counter some of the codswallop.