I'm going to say something that is going to trigger both sides! (I'm an Independent)
Firstly, this shooter had something in common with the shooter in Tennessee in 2023, who was a female to male transgender.
Minneapolis shooter was a male to female transgender who started transitioning as a teen(changed his birth certificate at age 17,had gender affirming care,etc) and his mother worked at the school and he attended the school. So , was familiar with how the school operated, worked,etc.
We don't know the home-life.
I support the 2nd amendment but I agree with durangogodwood above. I also propose to raise the legal age to purchase firearms to be 21, maybe even 25(heck you can't rent a car until you're 25!)nationwide. The frontal cortex of our brains aren't fully formed until the early 20's (I've raised children and been a child myself.) They may not make a difference in all school shootings like this one, but it's a start. I also support red flag laws. Can they be abused, sure but I support them nationwide.
Secondly, and I don't know if it would have made a difference in this case, But gender affirming care/hormones/surgery should not be legal until age 18, or even 21. I can't believe it's even a debate in our society,but children are being sterilized and given hormones before they are fully mature. This is nothing to do with bigotry it's common sense.
Once you are a legal adult then if you want to change your gender, go for it!
This case has strong similarities to the one in Tennessee.
I would add that there is so much toxic stuff on social media and corners of the internet, his manifesto was in Russian, apparently.
If Trump wanted to write these two EO's I'd support them.