To the first part of your question about whether the government should not data match, particularly in that case, I don't think I'm saying the government should never data match. The issue that came up in that case, which I believe went to the Supreme Court and is known familiarly as the “snowbirds case”, was the fact that the public was unaware of that and did not know, in fact, that their actions and their information were being tracked and matched.
On April 17th, 2008. See this statement in context.