Yeah loosing your wallet shouldn't be such a big deal, but it is because people are assholes.
I lost my wallet before, had a debit card in there along with gift cards and my drivers license. I retraced my steps, looked everywhere and deduced that It was either in my friends car or fell out of his car as I exited in front of my house.
It turned out to be the later because my friends car was bereft of my wallet. That wallet disapeared, wasn't in the gutters, bushes, nowhere. Someone found it, picked it up, probably went through it and took the valuables, then trashed the rest. What pisses me off is that my address is right on my DL, so, all they had to do was look at the adress of the house in front of them to see who's wallet it was.
If you find someones wallet, mail it to them.