I hope he paid the toll for crossing under the bridge. Usual melodramatic press coverage. If a light helicopter can structurally damage a cantilever bridge such as this then it hasn't been well designed.
In a former life I have flown under the Severn Bridge, the cantilever bridge at Pembroke in S Wales and the Kessock bridge by Inverness looking for "jumpers". It is perfectly safe to do and my biggest fear was that some kind member of the public may have tried to drop a brick through my rotor!!
HF