It's really interesting how some people wrongly claim that trans folks are more likely to commit mass shootings. The thing is, there aren't many trans people out there, so if just one of them is involved in a shooting, it messes up the statistics. Basically, trans people aren't going around shooting up places in any meaningful numbers, and anyone who says otherwise doesn't understand statistical biases like insignificant number bias or sample selection bias work.
edit: Depending on how you count a mass shooting, and if you count the person in denver who (allegedly) changed their identity to avoid hate crime charges.