Arthropod conservation

Shouldn't we have insects and spider conservation too? The Arthropod is the largest group of animal as compared to human and the four-legged animal. But what are the strong reasons to conserve them? Well the same reasons we conserved the Panda, I believe. So why aren't they given the same weigh? Their size ultimately and our lack of understanding about them brought about our neglect. So are we going to care about them soon? I doubt so.