Yeah, and land vehicles go under bridges a hell of a lot closer than 100 feet. Just stand on a motorway bridge one time and look at the lorries thudering past. A few feet either way and... SPLAT !!!!
38 tons of cornflakes can make one hell of a mess
but somehow they usually manage to miss...
So
"What would have happened if ..." is missing the point. No-one did hit the bridge, so let's not blame anyone for something that didn't happen.
BUT rules were broken and fuel has been given to the media / anti-aviation machine, so from that point of view maybe it wasn't the best idea in the world....