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According to your thinking everything should have been destroyed, hardened or not.

Of course not. Even in Hiroshoma at Ground Zero there were structures standing.

Contrast the widespread devestation of TC with only part of the Murrah building being destroyed despite the blast being maybe 15 feet away.

Contrast the widespread devestation of TC with only part of the Murrah building being destroyed despite the blast being maybe 15 feet away.
Okay, I've been contrasting, now what? You say even at Hiroshoma there were structures standing.
So, you believe a simple, low yield explosive like an ANFO explosive could do something that not even an atomic detonation could accomplish, no matter how close it was.
You continue to amaze me...
And you've not answered as to whether or not you know what a "hardened structure" even is, which is a very critical thing.

Contrast the widespread devestation of TC with only part of the Murrah building being destroyed despite the blast being maybe 15 feet away.
And why all the harping about "15 ft away"? Is that to indicate/emphasize a specific thing? Shouldn't the buildings on the other side of the street from the Murrah building have been just as damaged, yet aren't?

Small Businesses in OKC Area Struggle to Rebuild
The Oklahoma City office of Trader Publishing Company, which publishes four magazines - Auto Trader, Truck Trader, Bargain Post, and Boat, Bike, and RV Trader, was unable to print some of its magazines after its printer's building was damaged in the blast. The Journal Record, located directly across the street from the Murrah Federal Building, was in the process of printing Auto Trader and Truck Trader when the bomb exploded.
Damaged, not destroyed, at ?60 ft? away and the interior columns being blown apart were that far away too? Or is this where the "gravity induced collapse" is supposed to come in?
Again, your argument doesn't appear to hold water.