of U.S. Military Veterans...ergo, given firearms...who are Transgender...even a U.S. Navy SEAL. On the possibility that you might have a few neurons capable of Critical Thinking, you can find several more lists of well-functioning and successful Transgender persons throughout the country.
btw, there are many more 'Cisgender' people who have committed Mass Shooting murders...take for instance the Anti-Hispanic/Immigrant MAGA in El Paso, TX not that long ago.
There is nothing inherent in people with Gender Dysphoria that would make them a threat for Mass Murder...quite the contrary,,,THEY are the ones who are likely to be victims of violence from non-thinking cretins...look in the mirror, Lance.
Link: https://www.mentalhealth.va.gov/communityproviders/assets/docs/populations/TRANS_RESILIENCE_AND_MILITARY_SERVICE.pdf