The reason that there are vegetarian foods shaped like meat foods is that we live in a meat eating society. If you are invited to a barbecue and are vegetarian, what will you eat? What can you bring to the table that will fit on those hamburger buns, those hot dog buns, what will go with that mustard or ketchup?
If you are vegetarian and American and you find yourself on Thanksgiving AKA Turkey Day, what is going to be your central dish? Are you satisfied with a bevy of side dish types?
You like chicken but you don't like the politics of meat. You love bacon. You like hot dogs. But you aren't one for creative cooking, you don't know where to begin. What are you going to eat? The Ficken, the facon, the Tofurky...those are just replacements. And they don't taste like meat, anyway.