They shall be known as Bush's Laws of Motion

[William Seger]

57. What problem, for whom?

Vérinage is a technique suitable for any building with parallel load-bearing walls, but is not suitable for buildings with columns, because the basic technique is to use cables and jacks to cause pairs of parallel walls to fold and collapse simultaneously. It doesn't have anything to do with the material, e.g. it can be used on buildings with reinforced concrete load-bearing walls, but isn't suitable for buildings with reinforced concrete columns. So Vérinage isn't used on steel-framed buildings simply because those buildings have columns instead of load-bearing walls, not because steel is indestructible.

None of which has anything to do with what we've been discussing here. The relevance of Verinage to this discussion is that it's an actual example of the kinetic energy of the top of a building overcoming the structural strength of the bottom by simply falling on it, just as structural mechanics predict.

But now that you mention it, the fact that Vérinage isn't used on steel-framed buildings IS something of a problem for Chandler and Szamboti: They need to justify why they are comparing fine details of Vérinage collapse accelerations to the WTC towers and drawing conclusions from the differences if we're talking about building materials with different behavior characteristics. (That would be in addition to justifying doing "jolt" comparisons when Vérinage tops always fall squarely on the the bottoms, not tilted like the WTC towers.)