The purpose of this post is not to give any useful information, but to use information to make an interesting point.
First, the information: There are two basic ideas about how things came to be. One is that they just did, the other is that someone made them. In the first theory, the diversification of species is explained through macroevolution -- that "natural selection" or, rather, the weaker dying and the stronger living on to reproduce, brought about species progressively better suited to their enviroments. Man is the latest new and improved version. In the other way of looking at things, man was made to be the master of all the animals, blessed with a perfect body in a world that was good. Either way, the question may well be posed:
"Why could we possibly think it is better to put pieces of manufactured leather, plastic, and synthetics on our feet instead of just using them as they evolved/were created?
Man is the best thing so far produced, says the evolutionist. His feet must therefore be the product of all those billions upon billions of years added to our world's age to give more throws of the dice for mutation and random occurances that defy entropy.
Man is made to be the master, says the Creationist. God made man perfect and good, with perfect, masterly feet.
So, why wear shoes?
From the evolutionist's viewpoint, there is not a satisfactory answer. Perhaps we are in the midst of evolving, so that our feet aren't quite the best, like they should be. It is surprising, though, that there are so many animals that walk in bare feet without too many problems, while man needs shoes.
From the Creationist's viewpoint, there is one glaring reason that our feet need shoes: We fell from goodness and perfection, became messed up, and were cursed to fight against the thorns to get our living from the land. Thorns can sure hurt a foot. Shoes are a great idea, and make sense.
So that's why we should wear shoes. But don't be too quick to assume that man knows better than God -- we should be very careful when we hear about new, revolutionary shoe technology, that we don't jump into the shoes without looking first, to make sure they actually work better than our well-designed feet.