Media were the messengers of lies, but I'm not accusing them of lying, directly. The lies came from the Bush administration. Media just repleated them. That's not too good either; they failed to dig more. But it isn't the same as being who made things up.
There was a difference of opinion at the time,
Erm, no. Whether or not there were WMDs is a dichotomic variable. Yes or no. 1 or 0. It's not a matter of opinion. It's a fact either way.
and a new consensus that there had not been any such weapons. It corrected itself.
After hundreds of Americans and allies, and thousands of Iraqis, were killed, injured and displaced; a secular (if dictatorial) regime with significant participation of women and ethnic minorities was replaced with a mix of theocracies and ethnostates (including the open repression / genocide of Christians, Shias and Yazdanis and the creation of a safe harbor for international terrorism); the reputation of the USA and the West in general in the Middle East took its worst blow in centuries; a few people got rich through defense contracts; some more people got too much power through the increase of governmental power; and the then largest refugee crisis in decades started (only to get progressively worse as Iraq exported instability). Oh, and regarding WMDs, the USA showed the world that their possession was your last guarantee of sovereignty against an American intervention -- which has ultimately incentived the continuation of the nuclear programs of North Korea and Iran, the not disarming of Russia, and probably of India and Pakistan too, and for the first time since the War, the serious discussion of a nuclear program in Japan. And, finally, convinced other countries to pursue umbrella deals with some non US nuclear power too.
What a way to "correct itself"!
The world is a more unsafe place today than in March 2003. And the largest reason is the war in Iraq.
I'm not sure anyone is really unbiased. But I know that people who have been lying to you before (by which I meant, here, the government, not journalists just reporting what politicians said) shouldn't be trusted prima facie.