This is a rather interesting issue. Obviously, many of us who have no qualms dealing with reptiles have strong objections to many invertebrates...almost a similar attitude that most people feel towards reptiles. So does that make some of us hypocrites?
I, for one, hate roaches, and will kill them on sight. I just don't like them.
I second the various points others have already raised so far. Many insects (dragonflies, for example) are indeed endangered; but its much harder to monitor populations than with other types of animals. Now...regarding pest species like locusts, crickets, weavils, and roaches, etc...these insects are by no means endangered and unlike other "wild" species, their lives are very closely involved with human kind. They're almost like mice, rats, pigeons, ec; they're not "domesticated" persay, but 90% of their diet comes from living inside/near human dwellings. All of these animals are very prolific, and like I eluded to, they're just as endangered as rodents, or poultry.
So does that mean they still have no rights? I couldn't answer that...I would hate to see a world without dragonflies, but I could live without roaches. And it doesn't give me much pleasure knowing that roaches can survive high levels of radiation (along with ants, if I recall).