It's basically saying if you had a hard life you're more dangerous, because there's some justification in your past for violent outbursts
I find this the most insulting narrative that keeps being repeated, i.e that the struggles, history and lived experience of a transwoman is the most awful existence imaginable and their difficulties will trump everyone elses.
An example of the 'trauma' experienced by this person was given by the defence. They spoke of an incident that had happened in this persons youth when on one occasion her father had literally kicked her up the bum when she was arguing with a sister. Ok that may have upset them, and hurt a bit, but is that really the worst thing that could ever happen to anyone during their childhood?
Having known so many inspirational children and adults who have lived through so many extreme experiences (terminal illnesses, horrific abuse, congenital or acquired disabilities, severe disfigurements, excruciating mental anguish etc), it's an insult to expect anyone to prioritise the 'suffering' of this attacker.
They got the surgery and treatment they wanted, they had a supportive family, they came from a privileged background, they were extremely intelligent and were born white, male and able bodied.Their 'suffering' came no where near the suffering I've seen in other people nor the suffering they must have inflicted on their victims.
Incidentally no one I've known has ever used their suffering as a reason to take an axe to someone!