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Insects have a high food conversion rate, meaning less food to produce the same amount of protein as compared to traditional livestock.
wild insects can be toxic to humans, because they may have been exposed to insecticides and spores.
Insects contain high quality protein, vitamins, and amino acids.
Insects may add a huge variety to traditional cuisines
Many humans already do.
In the case of an apocalypse, eating insects for nutritional purposes would be easier.
changing the perception of what is edible/ not edible may take several generations
It depends on how they're prepared. Eaten raw, insects are known transmitters of parasites between animals (filarial, heart, horsehair worms). While this is much less likely as well, some carry diseases.