Because they are not big enough to warrant their own special category.. The Holiday season is so huge, they have an entire category of their own.. from a marketing and web standpoint, it is efficient, easy to develop, easy to use in promotions (such as what you see on their front page that takes you to the 'Holiday' section, and easy for the customers to locate what they are looking for.
Let the left eat them up with lawsuits, bad publicity, regulation, unions, etc. Yawn....Wal-Mart? What's that?
Let 'em boycott. Maybe there'll actually be room to push a cart in Walmart on Black Friday (the day after Thanksgiving). It's so bizarre to see all those men waiting in line at 6am to buy electronic stuff. Last year, I stood behind a group of 4 women with walkie-talkies. Each one headed for a desired sale object and collected for the other three. It was quite an operation. Usually, I push the cart and my 25 yo daughter strikes out and brings things back. It's an amazing experience!