Imagine being the parents of Brianna Ghey, listening to the evidence and transphobia presented during the trial and then being told by a bunch of people who have no relation to you, who seem to hold views that are antithetical to treating their daughter with dignity, that "well akshully" transphobia didn't play a part at all in her murder
None of us can possibly imagine what Brianna's parents feel. Not you, not me. It's crass for you to presume you do. I do not have to accept someone else's gender identity beliefs as true to think a child being cold bloodedly murdered by two other heartless children is tragic.
As I've said, it's possible both to think that what the two murderers said about Brianna was dehumanising and also transphobic (from one of them in particular), while not believing the motive for this murder was actually transphobia.