In both the PRACTICAL sense and the absolute.
Practical, in that we live in a nation that apparently cannot even manage a free and decent school lunch for kids who rely on this as their main meal of the day. One in five American kids -- kids in YOUR neighborhood and mine -- went to bed hungry last night, they take turns eating dinner with their siblings because their family cannot afford more, and neither party is doing a damn thing about it.
Hell, our party just passed permanent tax cuts for wealthy, money that could have paid for this, but we decided the rich needed the money more than those hungry children.
So no, there is no money for hundreds of thousands of mass occupancy multi-million dollar storm bunkers. We don't have money for hot dogs.
Taking that a step further, do the math. take a theoretical small town with 5000 people and a half dozen schools. Each would need it's own mass occupancy disaster bunker, each would cost millions, and each would need to be maintained. If you could build one of these for, say, 3 million a pop, you are talking about adding somewhere in the realm of a hundred bucks a month to every family's property tax bill. Forever. Or put another way, you are likely more than doubling the property taxes people pay -- this is an absolute impossibility of course, only the 1% could afford it -- and all to avoid an event that is unlikely to occur in anyone's lifetime.
Schools need to be made stronger, but there is a point at which there is nothing to be done. And at that point science takes over. We need to understand these storms better, we need better radars, better warning systems (my town's warning system hasn't worked in five or six years despite being hit by two tornados in that time period -- no money), better understanding.