Or perhaps just a bit of common sense and logic, at least as far as the towers.
All over the world, MANY thousands of skyscrapers stand year after year, doing their job (staying standing and safe and viable). Ordinary planned events like wind and storm and weather is clearly something that the engineers have planned well for, since there are so few major building failures due to normal events like weather or aging (if the buildings are maintained), for the planned lifespan of the buildings.
As this link shows, just the top 25 cities globally have many thousands of skyscrapers:
http://list25.com/25-cities-in-the-worl ... crapers/5/Now, cost is an issue with designing a building, just like any other business event. Standing up to say, wind and rain, is different than standing up to anything unexpected, like large jet airplanes full of fuel crashing into and burning in the building.
But whatever we do, as laymen and pundits, we should get all wild eyed and gesticulate and proclaim plots and conspiracies, even while thousands of the experts who actually successfully design and supervise the building of the many thousands of skyscrapers point out the physics and engineering support the fact that the planes brought down the twin towers. As does the physical evidence, like not finding evidence of the supposed explosives in the debris.
This is just like the mindset of AGW deniers. Since their intuition and world-view (often largely bereft of science) points against climate change, then no amount of data and no amount of actual science will convince them.