Access.
You have to be able to get to the barrels to remove them.
The first thing that would happen after a partial collapse of a building is a county engineer/building inspector would post the building as ‘danger do not enter. ‘ There would be no way to know if or when the rest of the building might fall on its own.
Until an architect engineer inspected the building and deemed it safe to enter no one would be permitted to work in the building.
If you look at the pictures of the first collapse there was no way to get to one side of the building due to the pile of barrels and collapsed building.
Looks like a lot of those whiskey barrels are still intact. Made of stout hardwood, I’m sure. Let us hope.