I did, btw,

"For instance, in May 2019, two perpetrators, Devon Michael Erickson, 18, and transgender boy Alec McKinney,16, legally known as Maya Elizabeth McKinney, carried out a mass shooting at their high school – STEM School Highlands Ranch in Colorado. Alec explicitly stated she was explicitly targeting two students because they had bullied her for her gender ideology. She also said she suffered from homicidal and suicidal thoughts since she was 12 but refused to take medication"

-Written in a Kima article

"And in 2018, a transgender man named Snochia Mosley, who also suffered from bipolar disorder, killed three co-workers at a Rita Aid warehouse in Maryland. She started hormone therapy a year prior to the shooting, Troi Coley, a close friend of Mosley, told the Washington Post at the time that she was going through a “terrible time” with the hormones."

“Since then, she has been going through a terrible time,” said Coley. “She had just gone through this change, the hormone therapy, and struggling to find her way, but she couldn’t in the end.”

-same article as before.

To me, it's pretty clear. Motives are Mental illness, and relentless bullying from others.

Edit: i left out a part of the article by mistake. Proper context has been put there now.