Okay, I'll make a go of it: Which insect-eating-insect relationships are morally justified in the context of farming, and why? Are ladybugs morally superior for their crop-protecting abilities or morally inferior for their consumption of peaceful herbivores?

This is along the same lines as asking a vegan cat-owner what they feed their cat. I know that it's trite, but it's worth pondering.

Edit: 1hr without a reply. Wasn't that difficult.