I hope they just played along to make you feel better.
So what about it? What makes that better than actually believing? Who the frick cares, and why is it such a big deal? I'd offer that a majority of the kids probably are just playing along by this time, probably been like that for some time in history. Has it actually contributed to the country's mental problems at all? Has it caused the obvious decline in morals this country seems to exhibit?
What does it matter to the adults if the kids believe or just fake it? Enjoy it while you can, because as its said earlier, its never going to be the same after that. So if your (mal)adjusted kids no longer believe in Santa once they turn 8, your Christmases will suck for the rest of your life. Wouldn't you like to extend the happiness of a childhood Christmas as long as possible?
Geez, quit taking shite so fricking seriously!