<p>It is relatively hard to create the ‘catastrophic’ bang by uncalibrated forces (i.e. the ship being bombed, straffed, etc.), the only real danger would be a leak of radioactive materials, however that can be minimized to some degree with the proper systems in place.</p>
<p>Not to mention, isn’t the best defense a good offense, so who wouldn’t want a ship that can run full speed around the world while others are limited by concerns over fuel consumption.</p>
<p>Having said that, I do believe that is why amphibous boats are not being considered, given their missions of beaching themselves to unload equipment, making for an easy target. Constantly moving surface warfare would be a much harder target.</p>