I grew up with my farmer grandpa who was a butcher, and I've seen him butcher lots of animals. I always have and probably always will find tongues & brains disgusting, even though I'm used to seeing how the sausage is made (literally).

Some things just tickle the brain in a bad way. I've killed plenty of fish myself, but I still wouldn't want to eat one that's still moving in my mouth, not because of ickiness or whatever, but just because the concept is unappealing. I don't think this is anywhere near as binary as you make it seem, really.