Butterflies have attractive colors, are aesthetically pleasing visitors to flower gardens and inspire with their free flight. Adult butterflies have sucking mouthparts and feed on nectar. They do no damage to plants and can be important pollinators. Most people like butterflies and associate them with a good environment.
The caterpillars of butterflies, with a few exceptions, are seldom pests. Most butterfly caterpillars have low population densities and feed on plants with little economic value. Exceptions include the Cabbage White Butterfly, a pest of cabbage and the Giant Swallowtail, whose caterpillars will feed on orange trees and are an occasional pest known a “the orange dog”. Butterflies are associated with good and not bad, precisely why Bart Simpson wants to be reincarnated as a butterfly: