Can you think of any reason why they made crying noises but produced no actual tears?
After my son died at the age nine, I never shed a tear for 10 years. During that period half my family died, including my Mum and Dad, who I loved dearly, but for some strange reason I never shed a tear.
Neither did I cry at my little boys funeral ... so strange, but I was tearing myself apart internally. I think I was in a sort of "automan" mode. I think I was so deadened by what had happened that something took over and controlled me thru life. It sort of protected me, but I must have looked very hard if any unsypathetic others were watching.
No one commented, except to say that I was very strong ... and it was true I spent more effort in looking after my daughter, my hubby and my aged parents than i did of me.
Maybe something strange like this happened to Kate and Gerry. They went into search for mode ... and get back Madeleine mode almost immediately ... altho Kate especially showed massive distress in her slumping body and face many times.
I dont think it is fair to judge people who have had such a shock and massive distress in their lives by your own limited experiences.