[eszed]

I entirely agree with your big-picture analysis. However, that

> the US Navy has operated reactors for 70 years with a perfect safety record,

in no way implies that the notoriously fly-by-night shipping industry would achieve similar performance!

Also the largest historical concern about nuclear cargo ships has been proliferation: if a significant quantity of fissionable material is floating about (literally and metaphorically) in private hands, then it would become orders of magnitude easier for malicious non-state actors to get ahold of, with potentially disastrous consequences, on a world-historical scale. Given the instability, corruption, and hostility of various nuclear-armed states in the last couple of decades, that cat may already be out of the bag, and that concern could (and perhaps should) be disregarded. I don't know, and I doubt anyone does. Institutional conservatism in this area is, however, understandable.