It's NOT any business of America's. The Swiss banks have done their privacy thing for generations and the world has survived. I see no reason for us to stick out noses in it now.
But if you take that away from them, Swiss banks will be no different than banks anywhere else in the world and you'll destroy their economy.
The world has survived, but not everyone in it. Osama bin Laden exploited Swiss banking privacy to deadly effect -- my apologies to Swiss bankers huddled around barrel fires for warmth -- but I think the lives of 3000 New Yorkers significantly outweigh my concern for their ability to market financial products.