Dr. Krauthammer attributes the effort to people who are insecure in their own religiosity, or lack thereof:
It is the more deracinated members of religious minorities, brought up largely ignorant of their own traditions, whose religious identity is so tenuous that they feel the need to be constantly on guard against displays of other religions -- and who think the solution to their predicament is to prevent the other guy from displaying his religion, rather than learning a bit about their own.
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I personally like Christmas because, since it is a day that for me is otherwise ordinary, I get to do nice things, such as covering for as many gentile colleagues as I could when I was a doctor at Massachusetts General Hospital. I will admit that my generosity had its rewards: I collected enough chits on Christmas Day to get reciprocal coverage not just for Yom Kippur but for both days of Rosh Hashana and my other major holiday, Opening Day at Fenway.
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I'm struck by the fact that you almost never find Orthodox Jews complaining about a Christmas creche in the public square. That is because their children, steeped in the richness of their own religious tradition, know who they are and are not threatened by Christians celebrating their religion in public. They are enlarged by it.
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To insist that the overwhelming majority of this country stifle its religious impulses in public so that minorities can feel "comfortable" not only understandably enrages the majority but commits two sins. The first is profound ungenerosity toward a majority of fellow citizens who have shown such generosity of spirit toward minority religions. The second is the sin of incomprehension -- a failure to appreciate the uniqueness of the communal American religious experience. Unlike, for example, the famously tolerant Ottoman Empire or the generally tolerant Europe of today, the United States does not merely allow minority religions to exist at its sufferance. It celebrates and welcomes and honors them.
It's well worth reading in toto.