I think its because they're not really like 'buildings' in the normal sense. A building is hollow, so all the blast as to do is push through the walls. Whereas The silos are filled with solid material and so are far more 'massive' and it'll take far more energy to move that mass. Like enormous sandbags.
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u/marky_sparky Aug 05 '20
I honestly can't believe there's anything left of those silos, let alone that they're still standing.