It's mostly a facade... well, I believe so. You have to have a holiday to get along together?
Well, put it like this. Even if it's a facade, it a day where peace is at it's best in several places around the world. Sure some do wrong on the day, but even still. I for one, could sit here, type about how unfair this Christmas is to me, simply because I'm spending it alone. The weather is keeping my wife and daughter at her parents house, and my best friend is in japan visiting her mother. I could spend my Christmas being negative about how today is not in my favor. However, I'm going to have my own, solo Christmas, and enjoy the day for what it is.
A day off, one where I can look out the window and see people smiling and enjoying themselves, and take the time to enjoy it myself.
It takes more energy to be negative about something where it takes so little to be positive. If your day is so bad, make someone else's day good today. Go to a neighbors door, offer them something that you cooked, or even a snack as a gift and just say "Merry Christmas". At the end of it, you'll have a good day.