is it unethical to kill bugs?

[Stranger]

I have no problem killing mosquitoes. With larger bugs, I use a cup and a piece of paper. Put the cup over the critter, slide a piece of paper underneath (or if that's too thin for you, use a sheet of thicker material). Then you can pick up the whole thing, take it outside, and with a swinging movement of the cup, launch your ex-roommate with an unfortunately large number of legs into the next chapter of its second density journey.