I agree about the flies, pesky insects that don't seem to do much other than exist to irritate. There's other instects too that bug the world. There's also insecticides to deal with these bugs. As long as the insecticides aren't so damn strong as to destroy all the flowers and grass and beautiful meadows and pollute the nice water in the river where you picnic at the same time they deal with these pesky bugs. And sometimes you even need flies, just to make life interesting; I get the feeling people aren't necessarily happy with a perfect forum, world and if there were no flies, they would eventually make their own flies just to add some spice to the dull flavor of everyday.