Bin Laden was a crazy jack ass in cave in some 3rd world Stan (Uzbekistan?) Mohammed Atta and his boys seemed to think a van-bomb in the parking under the WTC would bring it down

it was a silly plot that likely wouldn't of killed any one, as for the Oklahoma City thing, that was just a right wing loonie who thought a truck full of fertilizer could blow up that federal office
and all that worrying about bombs left every one blind to air attacks, like the guy that put a light plane full of gas and TNT into the IRS building in DC.