If it's a fly, roach, ant, or those stupid little moths that like to eat all your flour/nuts/grains, and it's in the house, it dies. If it's a mosquito and it's anywhere near me, it dies.
On the other hand, if I'm outside and I see a bee/fly/lizard/whatever got itself stuck in the pool, I'll fish it out and put it in the shade to give it a chance to recover (if it does). It's less that I mind killing an insect (vs. my convenience) and more that I don't like "suffering."
Spiders I leave alone, except poisonous ones (around here that just mean black widows). Although I won't let them turn the house into a webbed mecca. Or if I'm in bed and a spider crawls across my pillow near my face, there's a decent chance I'll kill it without thinking. ๐
The funniest tale in this arena for me is still when I rescued/nursed a small butterfly back to health. When I went into the yard to release it, it left my hand and flew into the air, freeeee. Then 3 seconds later a bird came dive bombing out of a tree and ate it. I was aghast for 5 more seconds, then hubby and I howled with laughter.
Such is life.