Most mass shooters are cisgender. only 0.1% are trans.
https://www.reuters.com/article/fact-check/majority-of-us-mass-shooters-are-cis-men-not-transgender-or-non-binary-people-idUSL1N363273/
>Of those, “the number of known suspects in mass shootings which are trans is under 10 for the last decade,” which translated to “1:880 [or 0.11%] of the 4,400 shootings” they recorded, he said.