When I came in as a new teacher, I had the same thoughts regarding school fortification. We have two armed guards at school and metal detectors. One guard at front door, the other roving. Our district actually got low 9 figures in stimulus to pay off decades of loan debt resulting from mismanagement and to make significant infrastructure improvements last year. We get metal doors next year, need the summer to install everything.
This is all to say that my opinion of fortifying schools has drifted closer to our shared opinion of arming teachers; it creates a prison atmosphere (one that I've seen at other schools, I'm lucky to teach in the best one in the city), and that low-trust environment is not conducive to learning.
At my most frustrated I am 100% "take everyone's guns away," then being pragmatic I'd rather the money go to mandatory buybacks and background checks and a registration system like the one we have for vehicles that puts pressure on manufacturers and sellers, as well as buyers to renew and recertify or else be in breach of regulation.