Yes. If the 25 were to be a net positive, I would agree. My educated guess is that it ends up not being one and other protection measures at schools should be implemented- yesterday.
I have to assume assaults, burglaries, rape and murders are also thwarted by ownership in 18-24 category. Is that # 40, is it 40,000; 400,000? That matters tremendously.
I’d be more for starting with metal detectors, updated doors and windows, additional officers per school to start.
Columbine was illegal gun purchase. Sandy Hook was a mothers gun purchases. Uvalde was gun purchase days after 18th bday. Which is why I mentioned a cool down, request to gun in hand time period for certain gun types, regardless of age.