How should ethical vegans think about insects

Many vegans, perhaps most, eschew honey and silk on the grounds of cruelty to the bees and silkworms. On the other hand, some non-vegans are suggesting that insects such as grasshoppers could be a significant food source in the future (link via @JaymiHeimbuch) [Of course, to vegans it goes without saying that becoming a vegan would be the most dramatic step toward "food security". But we must be prepared to confront arguments rationally and scientifically without resorting to vague, ambiguous claims.]