Spiders kill other crawly things.

Don't know where you live, but just be careful of the brown recluse. I have a "pet" spider that runs & hides every time I open up the door to the porch to go out at night. I've gotten used to him being there. (I need a life!) I did kill a spider in the bathroom tonight, although I was trying to take it ouside on a piece of cardboard. It's not always easy because they can be quick. Depending on where you live, some spiders can be poisonous or cause severe infections, but the majority are harmless and are just looking for a place to live. On Sanibel Island I had, among many creatures, those gigantic jumping spiders. Think they're called wolf spiders. It was really frightening to me to look up and see something out of a sci-fi movie above my head. They are large, hairy and jump quickly if you get near them. They don't make webs, but are hunters and somehow get into homes. People on the island usually left them alone & had names for them like Fred. I don't like to kill anything, but I certainly understand your fear. I've killed a lot of bugs in my life, especially since I moved to FL. However, if you can put on a pair of gloves and sort of coach a spider or a bug into a jar, it's better to put them outside and let them do their thing. They were here first. :-)