I bought a flyswatter for my girlfriend to deal with a fly she hadn't been able to shoo out but usually we would go to great lengths to capture and release invaders outside, especially spiders whose company we tend to romanticize. I am not feeling especially regretful about the purchase but I got to wondering what opinions people here might have.
I have been influenced toward this concern by the essays I read on Brian Tomasik's Reducing Suffering website, here is the section on invertebrates. I'm self-conscious of stifling this survey with that slightly ponderous link. I am not sure that I always track the calculus of his moral methods, though I appreciate the thoughtful approach.