When my wife died, in her early 50s, I requested that people did not wear black or drab coloured clothes because - although this was a sad and serious occasion - we were there to celebrate that she had lived and that our lives were richer for that. Of course , I was grieving (and still am) but the sharpness of my grief actually came rather later.
Vlad asks: "Why the fear of mourning or displaying grief?" There is no fear of mourning, but people in mourning should be left to find their own way. Not be forced into a particular form of grieving because the Victorians went over the top. Mourning is a period of adjustment to a new reality - the pain of loss is always there, but so is the need to adjust to a new, unplanned future.
I think, perhaps, that Matron should think very carefully about letting Vlad near the keyboard ...