I think too many insects die because people deem them pests, but they make the world go 'round.
It's just unfortunate they choose to live in our homes with us or eat our plants, but with the butterly population seemingly in decline, relocation is better than killing (well, even if the butterfly population wasn't in decline). I remember seeing Monarchs and Swallowtails all over the place as a kid, nowadays, any butterfly is a rare sight.
Hubby has a friend who killed an Orb weaver spider and posts about it on Facebook. He got quite the comments after asking what it was, that it was a harmless spider and he should have left it alone. His response? "Well, it didn't have to make a web on my fence."
I'm the type of person who leaves the spiders alone in our apartment, until they get too large for comfort and they're relocated outside. Living with my folks, if I spotted a snake, relocated it as well. I can't say the same for others I know, they'd kill a Garter snake on sight.
Planto