They were wrong? Based on what? Politicians? The fact is we don't know what all is buried in the sand over there and what happened to the known chemical WMDs.
The point is that while some individual reports MAY have been wrong -- we don't KNOW they actually were wrong, and neither does the Senate committee.
Also, even if some individual reports MAY have been wrong, the overall conclusion that Saddam was a direct threat to us, was not wrong. The Senate committee also ignored Putin's statement, that their intelligence had information that Saddam himself was planning terror attacks against the US.