He/she can go fuck himself/herself and I hope he/she burns in hell.
In the end, it doesn't matter that the shooter was trans.
They shot and killed children.
They're just as much a terrorist and was dealt with properly as other mass shooters.
The ONLY reason the trans issue should even be part of this, is to learn if being trans had anything to do with the 'reasoning', so this kind'a thing can be PREVENTED.
But in the end, they got what they fucking deserved.