Too often, a nutcase appears out of nowhere, with little warning and a clean criminal/mental health record. But when we do have clear warnings or indications, it has to be a priority to respond to those, and enter the information needed to allow the current system to work as intended.
After each school shooting some number of politicians will punctuate their ‘learned’ perorations with the statement that we must “make sure it never happens again”.
Maybe a few politicians are catching on because I hear that less now than after the earlier school shootings. But, of course, it is and always has been impossible to make sure a school shooting “never happens again”.
And that makes your points all the more critical that those responsible do what is required of them to at least make it less likely that it will happen again.