You're walking on the sidewalk and by your pace, you can tell that your next step will land on a little bug critter, do you slightly adjust your foot to spare the little guy? 1
This is as minimal effort scenario of "saving" vs killing a bug I could think of where you're presented with the options and make a choice.
I'll usually save larger bugs if they wind up somewhere they shouldn't. We'll also vacuum them up in the Dyson and where live in the vacuum canister with other bugs until it's dumped.
Flies 2 and mosquitos are KOS though, I guess there's an annoyance factor at play there.
Are you a saver, ignorer, or exterminator?
Footnotes
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Let's assume no residue is left on your shoe lol ↩
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Interesting Air Force concept video from 16 years ago about mechanical spying flies. ↩