Do insects feel pain when injured?

I had a butterfly get stuck in my windshield wiper, and when I pulled over to let get it out, I was devastated to see that it's lower body was crushed and one of it's lower wings was torn. It crawled on my hand and acted as if nothing was wrong, so although my initial thought was to just kill it and put it... show more I had a butterfly get stuck in my windshield wiper, and when I pulled over to let get it out, I was devastated to see that it's lower body was crushed and one of it's lower wings was torn. It crawled on my hand and acted as if nothing was wrong, so although my initial thought was to just kill it and put it out of it's misery, I ended up putting it on a flower in the shade. It couldn't fly anymore with the shape it was in, but I figured it could enjoy it's last moments on Earth on a flower, which I know butterflies love. My question is, how could it still be alive with it's body crushed, and do insects/butterflies feel pain like we do? Do they have nerves? Can some "bug people"answer this please, as I'm not some "crazy lady" and would like serious answers! Thanks!
Update: I looked up the word I was looking for instead of "bug people" - entomologists! Sorry if I insulted anyone!
Update 2: To Marcellus Wallace: Apparently you did not read my "additional details" in which I apologized to anyone who I might have offended by using the term "bug people". I knew someone once who was an entomologist and know they hated references like that. I was upset about the butterfly and could... show more To Marcellus Wallace: Apparently you did not read my "additional details" in which I apologized to anyone who I might have offended by using the term "bug people". I knew someone once who was an entomologist and know they hated references like that. I was upset about the butterfly and could not think of the term for people who study insects. I tried to change the question after I did a search, but couldn't after I had posted it - so again, my apologies. :) There's really nothing I can do or say other than that!
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