In your mind rate the following creatures as good or bad. Don't think about it, just go with your first emotion.
Brown grasshopper
I don't know about you, but I would guess it might be common to rate grasshoppers as good, maybe even cute. Spiders might be thought of as bad or maybe scary. Guess what? The good, cute grasshoppers are totally decimating my landscape - eating holes in leaves, and damaging garden and yard plants. The evil, scary spiders are catching grasshoppers in their webs, which for me is a good thing. There just might be a lesson to be learned here...