This is such a stupid take. And shows your inability to grasp first order logic. 9 people are dead, some of whom are not even teenagers, and you're pulling at the one part of the tragedy that doesn't matter at all. The point should be doing the maximum to make sure it doesnt happen again. So I am going to take the time to write this out in small words that you can process... Sorry, Understand... Sorry, "know what they mean":
IT DOES NOT MATTER THAT THE SHOOTER WAS TRANSGENDER... sorry, "wore different clothes than they might as someone with a penis".
IT MATTERS THAT THEY HAD A SEVERE ENOUGH MENTAL HEALTH PROBLEM THAT THEY WERE REMOVED (took out of) THEIR HOME ON AT LEAST ONCE.
THAT SHOULD BE ENOUGH TO HAVE THE GUNS REMOVED FROM THEIR HOME PERMANENTLY (for ever).
THIS SHOULD APPLY TO ALL PEOPLE WITH MENTAL HEALTH PROBLEMS THAT MAKE THEM VIOLENT.
THE VAST MAJORITY (the most, by a lot) OF SCHOOL/MASS SHOOTINGS ARE CARRIED OUT BY STRAIGHT WHITE MEN. WHAT YOU ARE SAYING IS THAT WE SHOULD TAKE ALL GUNS AWAY FROM STRAIGHT WHITE MEN, BECAUSE THAT WOULD DO THE MOST TO STOP FUTURE SHOOTINGS.
I tried to keep the words small for you. I added more information in brackets (<- these things ->) where I had to use a big word.
I hope that helps.