There's a way to get rid of this possibility, or at least to minimize its impact.
This is a world of computers. Destroy the school buildings or sell them off, have the local school district instead issue each student a computer if they do not have one at home. Have the classes online.
This is a process that can happen today if we got behind it and made it happen.
College courses are taken online all of the time. There is no reason on earth that we can't do this for grade school through high school.
It doesn't necessarily have to be done exactly like this, but the possibilities of doing something similar to this is legion.
Right now all of our kids are in one "Known" location. Break up the target area and create hundreds of thousands of target areas and you make survivability not only more realistic but you also take away a tool of terror from the Isamonazis.
If you need the classroom atmosphere, parents could get together and have their homes for a small group of children used for this purpose. Something that could be changed from time to time to give the kids a new or different location.
Homeschooling is also another possibility.
We have to start thinking outside the box in order to defeat the Terrorists and protect our loved ones.
This is an excellent idea but will never see the light of day because of the NEA, who have almost all Dem politicians in their pocket.
If the NEA saw its ability to continue herding American children into classrooms and indoctrinating them (out of sight of their parents), they would riot.
That said, we are already doing what you prescribed -- privately. We bought our own computer, and with our own money pay for an online high school curriculum for our son.
The University of Nebraska is just one accredited institution that offers a complete high school curriculum --completely online. (I believe the University of Missouri has one too, although some courses are still done the old-fashioned correspondence way.)
I think that's the future. Especially colleges