What is wrong with these people?

So….
Why do people give their pets personality’s that they portray to the world in the forms of…Sending people cards addressed and written “from” the pet….opening face book profiles for the pet….speaking on behalf of the pet…asking you if you want to “talk” to the pet if you phone them….and so on?

I understand the attachment people have with their pets…. But making a persona for the pet seems a little overboard….and a little disturbing…...

I have had pets all my life…I have never felt this need…..Can anyone explain this to me?