We're very determined as a society that everyone should be dignified and gracious at all times. People who lose their temper, express unbridled emotion in public, are disapproved of. Maturity = self control etc.
I get that, I feel it strongly myself. I hate the impact this has on the staff trapped in with the family. Their incredible resilience is beyond reproach.
That said, so what if people don't conform to that! What if people express what they are feeling, the rage, distress, disbelief etc.
'Do not go gently into that long goodnight,
Rage, rage against the dying of the light!'