For me, it's less about the numbers and more about who did it and the complexity. The coordination involved in hijacking multiple planes. The symbolic effect

For me, it's less about the numbers and more about who did it and the complexity. The coordination involved in hijacking multiple planes. The symbolic effect of destroying and damaging icons. The foreign organization and leader who has a history against the U.S due to the country's involvement in the Middle East. The reason why OKC makes more sense is because the damage was caused from within by their own citizens, which potentially has a different scope as to what should be done next.