If you know the parent of a disturbed young person who could become a school shooter, you might want to remind the parent to lock up their weaponry. Parents of kids who become shooters are being arrested and charged with serious felonies.
For example, Colin Gray, the father of the recent Georgia school shooter Colt Gray, has also been arrested. It is claimed he gave his son the AR-15 style rifle the son used to kill four people and wound several more.
It is bad enough if your messed up kid kills one or more people, you won't live that down. But to go to jail because you weren't a child psychologist par excellence (most of us aren't) who could straighten out your little monster will ruin your life irretrievably.
A gun safe is cheap insurance, and will protect other valuables too.