details about Westman's trans status
https://en.wikipedia.org/wiki/Annunciation_Catholic_Church_shooting#Perpetrator
Westman at one point identified as transgender. Westman's given name was legally changed in 2019,[41] but before the attack Westman expressed being "tired of being trans" and wished to have "never brainwashed myself" in a diary entry. Westman further wrote that, "I don't want to dress girly all the time but I guess sometimes I really like it. I know I am not a woman but I definitely don't feel like a man."[42][43] There is no evidence that Westman had begun medical transition.
details about manifesto
Westman posted two YouTube videos, one 10 minutes and the other 20 minutes long, showing writings which referenced suicide, depression, "extremely violent thoughts and ideas", a message addressed "to my family and friends", and a drawing of the layout of a church.[47] A video showed a quantity of guns, bullets, and magazines. Messages written on the guns and magazines included phrases of antisemitic, anti-Catholic, and racist nature, "kill Donald Trump", "6 million wasn't enough" (referring to the death toll of the Holocaust), and the names of mass shooters Robert Bowers, Natalie Rupnow, Adam Lanza, James Holmes, Pekka-Eric Auvinen, Anders Behring Breivik, Marc Lépine, Charles Whitman, Vladislav Roslyakov, Payton Gendron and Brenton Tarrant, the last of whom also wrote similar style inscriptions in white font on his firearms, gear and magazines.
any particular reason, or just like a mental health break?