For this to be terrorism, someone would have needed to have the material to blow the joints, as well as the knowledge of where to place them and a means to detonate them. They would have needed to place these charges on a well traveled bridge, while bridge work was going on. Then they would have needed to hope that the workers didn’t detect anything or accidently knock the charges loose. And even then, there would have been absolutely no way to be certain that the entire bridge would blow and cause widespread death.
For the same amount of effort, a terrorist with the ability to do this could have placed charges in an office building parking garage at night. Had a much lower chance of detection, been able to insure that the entire building collapsed and kill hundreds of people.
So, why would a terrorist go to so much effort to plan a very sophisticated attack which, while tragic for those who died, would be considered fairly minor?
Rewatch the video and tell me where the explosion was. Where was the smoke? Where were the reports of odor from the explosives? Why did everything go down and nothing blast out? The reality is, that a terrorist who was sophisticated enough to do this could have done more damage than any of us want to think about.
“For the same amount of effort, a terrorist with the ability to do this could have placed charges in an office building parking garage at night. Had a much lower chance of detection, been able to insure that the entire building collapsed and kill hundreds of people.”
I don’t understand why you (and others? it was way earlier) seem to think it’s easy to blow up a building, without all the knowledge of where best to put the charges.