There might be plenty of industrial salt, but you still need a vehicle to haul it back. Planes, trains, and automobiles are all barely operational; many flights have been canceled and several road segments are impassable. Consequently, the inventory of industrial salt within Beijing isn't abundant. I did manage to secure a decent stock, thanks to Tang Yuxin's timely reminder. Otherwise, I too would have been powerless in this situation.
"Indeed," Tang Yuxin prided herself on her ability to foresee such events. She might be the only person in the world who could have known and prepared for them. Of course, her actions weren't solely for her own benefit; they saved many others as well.
This could also be seen as a form of saving people.