Research into whether invertebrates can suffer has accelerated in recent years, with compelling evidence emerging for crustaceans, cephalopods, and even some insects.
The precautionary principle suggests we should give benefit of the doubt to animals where sentience evidence is uncertain but plausible. Dismissing invertebrate suffering on grounds of 'they're just insects' risks ignoring vast amounts of potential suffering. The cost of improving invertebrate welfare conditions is often low relative to the scale of potential benefit.