How should we treat insects?

Insect farming, we’re told by its proponents, is the next big thing in edible protein production, and it may just save the environment. But an insect “farm” is more like a manufacturing plant, where tiny organisms are frozen, boiled, baked, crushed or shredded alive in their billions. What is the moral status of these living things? Can we be sure they’re not sentient beings, capable of experiencing pain and suffering? And if we can’t be sure, how should we treat them?