This is, of course, going to be used by the media to demonize trans people. It's already happening.
If the shooting had been done by a white republican then it would be used to demonise said demographic. Unfortunately no suprises there.
Normally, it is done by people who intend to kill their peers because their peers do not immediately know and fight for the immediate desires of the shooter, despite the fact society does not have magical powers that yield that information free of active communication, and despite the fact that while people owe others the freedom to act as they see fit, that right ends abruptly where someone else right to live as they see fit extends.
Usually, the demand asked for is unreasonable: that peers pay special attention without call or reason or interest to them, both platonic and romantic.
Sometimes the demand asked for is reasonable: simply that some folks not be allowed to consistently bully them.
Sometimes the demand might be to have access to hormones and teachers that are willing to refrain from assigning gender on them, and this is certainly a reasonable demand.
The issue is that they make these demands at gunpoint with manifestos, and murder, and blood, and
that is an issue of culture, and altogether too often an element growing as a cancer, metastasized by the presence of a gun, and spread as a meme among young, primarily masculine leaning groups. This is NOT reasonable. Violence in this way is not reasonable.
A fight over this in the halls of congress with legislation is reasonable. A gunfight with the people who come to drag you away from your parents or to take your medication? That's reasonable. A protracted war against a regime that will take away the kids of folks who don't have the means to fight for them? Totally reasonable.
A fight with your classmates who had nothing to do with that, while having never even discussed situations of bullying and abuse with your parents or school officials? That's madness, ill-informed ill-advised madness that will only end in lives lost and causes that you champion attacked.
There are more correct battle grounds, and the blood of the sacrifices made of the lives of others will not serve as ink to write any of the words they wish.
The way to terminate that cycle remains not in demonizing those whose demands are reasonable, but depriving them of unreasonable means to pursue them at ages too immature to even start to understand how.
And I suppose in teaching them which demands are unreasonable to make, namely based on the consent of others to participate and their utter lack of obligation to do so.