(1) there is an often heard argument, or at least excuse, but it has problems. First, the cost problem is pretty much universal. Nuclear has stalled out everywhere (even in China it's experiencing cost problems and is underachieving). This suggests issues that go beyond local regulatory burdens. Second, what's the alternative? Just trusting the builders/operators to be good boys? That won't work. Appointing Philosopher King Regulators who can tell ahead of time just what regulations are actually necessary? How can they do that?

(2)'s first sentence would be a valid argument if the choice were between nuclear and climate change. But that's not the choice being made. That nuclear is better than climate change is damning with faint praise, the "it's better than a poke in the eye" of energy arguments.

As for naval reactors... putting a nuclear reactor in a ship increases the overall cost of building and operating that ship, compared to burning oil. And this is true even though burning oil is very uncompetitive for grid power generation. There's a reason the majority of the ships in the US Navy are not nuclear powered.