> One important difference: salt-water animals (including crustaceans) harbor parasites which are less compatible with humans, for them humans are dead-end, they can't close the complex reproduction cycle. Land insects and fresh-water crustaceans (e.g. crayfish) are much more dangerous for humans.

Nice point. The flip side is that with land based insects the parasites can close the cycle with humans/mammals and hence insect consumption can be more risky.

(Parent comment) > if you eat fresh produce from your garden, there are likely to come some small critters along with that.

Eating food with the occasional insect that has gotten through (e.g in a vegetable or salad) will not be as risky as eating large amounts of insect mass. The probability of then getting a parasite or disease then will be much higher. Its just mathematics.

Why increase your risk probability?