For me it depends. Mosquitos, gnats, flies, etc. yes, if there in the wrong place. Otherwise I just leave them alone. I would never kill caterpillars, butterflies, dragonflies, bees, wasps (As long as they are not nesting in the wrong places!), or any insect that is cool or beneficial to the environment. In other words, there are less insects I WOULD kill then I wouldn't. I also have zero-tolerance for killing spiders. Spiders are so misunderstood! They rarely bite (If you do get bit, don't blame the spider! You just held the poor thing incorrectly!), and they are amazing pest control agents! I understand that they frighten a lot of people, but given how many environmental benefits they have (ESPECIALLY for gardeners and farmers!), there should not be ANY reason to kill the poor things! If there is one in the house, catch it, and put it in the garden! Don't kill it!
