currents can be large in magnitude their time duration is quite short. To conduct lightning
currents with copper conductors is really no big deal. A significant lightning strike might produce a current
of 10,000 amps for a millisecond. Electrical
systems that carry 3,000 amps for hours exist all over.
What is commonly called lightning protection is not to protect from being struck but to safely conduct the current
to minimize damage to structure and nearby occupants. The only way to reduce the probability of being on the receiving end of Thor is to be in the shadow of something taller and made of a better conductor.