What?

MOST raw fish living in a wild sea environment is perfectly safe to eat. (heavy asterisk being don't sue me if you get that wrong, I'm an idiot on the internet, not a real person). If you catch a tuna with a pole, slice it and take a bite, you'll probably be fine, with a VERY small chance you'll get worms (you can kill those with good certainty with the aforementioned deep freeze method). Shellfish are typically fine too.

Now if you take that fish, cut it up in a dirty place and put it in a package to rest for a couple days before consumption, that can be a problem, so if you get it from a supermarket in Kansas, it's probably not ideal to eat raw.

Now fish that live in/go into freshwater (salmon being a big one) are more likely to be contaminated with freshwater parasites. Almost all sushi grade salmon is farmed.