C_J I wouldn’t dream of killing a spider.
Unfortunately you do sometimes have to. If you live in an old house with tons of places for them, then you do have to have a cull sometimes. Especially the preggers ones, or the egg sacs, they need to be hoovered up or you’ll get hundreds of the little bastards running around.
However, my general point still stands, especially if you live in a place that has lots of mosquitoes. It’s useful to allow a spider or two because mosquitoes are thick as pigshit and happily fly into spider’s webs all day long.