I have a friend who doesn’t kill spiders that he finds in his house because he says they kill other bugs. WHAT OTHER BUGS!? Spiders ARE the bugs! What other bugs? Ants? Who cares about ants? Spiders are the only bugs. That’s like cops not arresting murderers because occasionally they kill a coke dealer. Sure, they are annoying and gross and you don’t really want them in your house, but we must exterminate evil.