I would never kill any insects in my garden, oh, wait, greenfly and blackfly I kill and the occasional wasp if it won't leave me alone. However, if a spider comes into my home, I encourage it to leave. If it stamps its foot and refuses, then I'm afraid it's dead! I always think, if I was the same size as the spider, it would give me a bite which paralysed me, then it would cocoon me up and leave me hanging somewhere to tenderise and then return and eat me, so no conscience here I'm afraid. Daddy long legs, now that's anther matter entirely, I usually run round the room waving my arms like a bloody windmill screaming to my DH "Get it, kill it, for f***s sake kill it!!" 