Oh, it was all a gigantic "mistake," we're told: "everyone" thought Saddam had "weapons of mass destruction." Except "everybody" didn't: there was significant dissent within the intelligence community, which was systematically silenced by the White House and specifically by de facto President Dick Cheney and his neocon staff. The policy shop at the Pentagon, under Douglas Feith, regularly falsified "intelligence" to fit the administration's preconceived conclusions. And when the lies began to catch up with him, Feith resigned.
The Senate conducted an investigation into prewar intelligence-gathering, but the several reports it issued were compromised by partisan bickering and wound up basically whitewashing the entire process: in particular, the key role played by Feith's rogue Office of Special Plans and the complementary Policy Counterterrorism Evaluation Group was swept under the rug. No one was held accountable.
And, on this side of the Atlantic, no one has said "I'm sorry."