Why do people wear shoes inside their homes? Is there any historical explanation?

cold feet usually

Well, especially in European places, it's cold for significant portions of the year. Historically, animals (dogs) were kept in the homes, heating was not good, so shoes HAD to be warn for protection and cleanliness. In many other part of the world, people lived in homes with earthen floors; there was no difference between outside and inside flooring. So what should shoe removal matter to them?

makes for a quick get-away!

Personal preference

because they are too lazy to take them off after coming in from outside...

As soon as i get in my home the first thing to go are the shoes Ive been wearing all day,I love to run around barefoot,on the carpet..lol