Ever wonder why the terrorist alert levels were raised?

According to Tom Ridge in this USA Today article, the terrorist alert levels weren't being raised because the Department of Homeland Security was concerned:

"The Bush administration periodically put the USA on high alert for terrorist attacks even though then-Homeland Security chief Tom Ridge argued there was only flimsy evidence to justify raising the threat level, Ridge now says.

"Ridge, who resigned Feb. 1, said Tuesday that he often disagreed with administration officials who wanted to elevate the threat level to orange, or 'high' risk of terrorist attack, but was overruled."

[snip]

"'More often than not we were the least inclined to raise it,' Ridge told reporters. 'Sometimes we disagreed with the intelligence assessment. Sometimes we thought even if the intelligence was good, you don't necessarily put the country on (alert). ... There were times when some people were really aggressive about raising it, and we said, 'For that?' '"