You are defending a pair of sadistic killers
No one has defended Brianna's killers. People have analysed their motives. Analysis of a killer's motives is not defending that killer. Defending them would be claiming that Brianna "had it coming" or similar, which literally no one has said. To the contrary, on a parenting website, posters are likely to be appalled and also concerned as to how to determine whether one's own children might be at risk of committing or being targetted for a similar crime. That's why we are avoiding the at-a-glance conclusion of "transphobia" and digging deeper. That's one hyperbolic statement from you.
It features daily in almost every mainstream newspaper.
Like fuck it does. Have you read Metro, Guardian, or Independent recently? That's a second hyperbolic statement from you.
It exists in almost every pub, street and workplace; it exists in healthcare organisations; in family homes and in the halls of government.
I think what you really mean here is "employers and service providers are recognising that sex still matters and that the law allows them, and in a couple of instances requires them, to apply sex-based exemptions". Losing privilege feels like oppression when you've got used to having privilege, and being allowed to waltz into female changing rooms was a very desirable privilege for a particular subset of males. A third hyperbolic statement from you. I find it hard to take seriously people who resort to hyperbole repeatedly.
Mrs Justice Yip called the murder "exceptionally brutal and planned" and partly motivated by "hostility" due to Brianna's transgender identity.
Mrs Justice Yip's interpretation isn't the only opinion out there. The police didn't consider transphobia to be a motive for those murderers to choose Brianna. We all read the messages and followed the case and we can make our own minds up. My view, based on the appalling messages we all saw, is that Jenkinson saw Brianna as very pretty far more than as trans, and wanted to take Brianna's eyes in the same way that a lepidopterist wants to capture a beautiful butterfly only to kill it and pin it to a board. I remind you that Brianna was Jenkinson's second choice of victim, which is not consistent with transphobia as a motive when the first choice victim was not trans.