[I also think that everything General Kelly said, from the VERY beginning to the end when he left the podium is something people should hear, in its entirety, before criticizing Kelly or Trump.]
I agree with you that it is something people need to hear but I have to disagree that it is something that people need to hear before criticizing Trump.  In true Trump fashion he jumped on a political landmine with both feet and attacked a gold star mother rather than simply admitted that he misspoke.  This was a golden presidential moment but Trump had to go and screw it up by making it political (Obama never did this) and verbally attacking a grieving mother.  I'd even argue that if Trump had just come out and said he was trying to follow Kelly's advice and script but misspoke the media would have actually been ON HIS SIDE just because of how sacred Americans hold gold star families.