But somehow, when applied to fish, it's oddly horrifying...

I will, for the sake of argument, assume you're like the majority of folks who enjoy an occasional boiled whole lobster, or soft-shelled crab. Given that, have you examined your reaction deeply enough to explain why you don't find that revolting (as I do), whereas surimi is horrifying to you?

I mean, surimi is made from processed fish, but it's...fish, not fish-guts. To me, it's the moral equivalent of tuna salad, whereas giant sea-cockroaches lobsters...well, and eating a whole soft-shelled crab...gack, that gives me nightmares.