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Cargo ships could be replaced with nuclear. It would also be a significant gain as they are a significant source of pollution beyond CO2.
Theoretically yes, but in practice nuclear is very complicated technology that requires a lot training, expertise, care, maintenance and oversight.
Putting it into military ships and ice breaking ships makes sense because of their unique circumstances.
With cargo ships there are a lot of additional complicating factors: cargo ships regularly break and sink. Not a lot, but frequently enough that it is a legitimate concern. We already have trouble regulating regular cargo ships sea-worthiness and issues like environmental pollution through ship breaking, notably in india. That's another issue btw..
The biggest problem is the sheer number of cargo ships. Any risk of an accident gets multiplied by that.
You can browse the wiki page on nuclear propulsion. https://en.wikipedia.org/wiki/Nuclear_marine_propulsion (btw, if it was economic to do it they would have done it already) It's "obvious" that the number of ships with nuclear propulsion are in the low hundreds. Meanwhile we have more than 100.000 merchant ships in operation at the moment. https://www.ener8.com/merchant-fleet-infographic-2023/
Operating "a few" ships safely is one thing, doing it with literally hundreds of thousands is something completely different.
Reactors aren't bombs, they don't just go boom. One of them sinking is far less dangerous than thousands of gallons of fuel in existing tankers. The economics are terribly different than electric cars, it makes no sense to replace a ship with 20 year of life left, but it's worth considering for a new ship.
There is still the anything nuclear is the boogie man problem.
And what about when terrorists like the Houthis capture one? Just trust they can’t extract the materials to build dirty bombs?
A reactor isn't a catalytic converter. They might get some coolant that's mildly radioactive. The core would probably kill them if they ever managed to open it. There's not a button to just open it, it's only designed to be opened with heavy equipment in drydock.
Dirty bombs are more of a boogie man than a real thing. High grade materials are dangerous to be around without shielding and can fairly easily be tracked. It's just as likely to kill the makers before they can get a bomb together than be used. Lower grade materials require more to be dangerous, which means less spread with the same explosive, and the bomb has to be pretty big. It's easier to get a backpack full of explosives into somewhere than a van full of radioactive material, and the backpack will have a bigger radius.