If you narrow the stat to “shooting up Christian children” then no, it isn’t non-trans men (I’m not going to “cis”) doing it.
“mass shooting” is too general - it includes gang related events.
This kind of reporting has become a parody and nearly all of us have been sucked into it.
It’s simple really...when a person goes to the gun range for some target practice, he is a “SHOOTER”.
When a person, without legal or moral justification, kills another person with a gun, he is a MURDERER. It even “feels” different when you read it.
Language makes a difference. Control the language and you control the culture.