A. The casks they use to ship nuclear fuel have been very robustly tested. Dropped on spikes. Put underwater. Set on fire. Compare that to many other things that are shipped on trains that are not as well protected. The risk is so small that the benefits far outweigh it.” --Grist
There was one thing you didn't do, when you were dropping things on spikes.
You weren't leaving them alone under a mountain for 20 000 years.