Wrong. A shipload of amonium nitrate is a far cry from a ryder truckload. As I stated above, name one time a ANFO bomb was contructed to blow up a buiding before OKC.
Didn't they use ANFO and a Ryder van in 1993 to attempt to blow up the WTC? I recall seeing pictures showing that it was parked next to a reinforced wall which reflected the explosion outward. It also removed at least two floors from the parking garage but left the support beams basically intact.
Not really. The ship was some distance from what was destroyed (as someone pointed out earlier, blast effects are substantially reduced by distance). The truck was just a few feet away. Proportionally, it works out about the same.
As I stated above, there are numerous comparable instances with comparable results. The only difference was accident vs. intent, which has absolutely no bearing on physics.