There is absolutely no point in arguing with someone who believes the bull**** conspiracy theories - their suspension of belief is absolute.
The whole "weapons of mass destruction" is a funny little beast. Anyone who thinks Iraq was toting nuclear weapons needs to put down the crack pipe - they did not have the capability to build the weapons required to fight nuclear war, notwithstanding the presence of uranium compounds. A "dirty bomb" is another matter entirely. Any half-assed competent undergraduate physics student could build a dirty bomb though, so that point is somewhat moot.
The real issue in Iraq was, of course, chemical warfare. It's pretty well documented that Hussein mounted multiple chemical attacks on the Kurdish population, so chemical warfare capacity was definitely there. The other issue is biological - while rudimentary labs were found, nothing I've read has me remotely convinced that Iraq was capable of mounting a biological attack on anyone, save perhaps their own populace.
The sticky issue is not that Iraq had some so-called "weapons of mass destruction;" the issue is that the WMDs that everyone believed American leadership were referring to were of the nuclear variety. Very frightening, high profile, nasty beasts. They weren't. But that doesn't negate the fact that Iraq had so-called CBRNE threats - or at least, the C, R, E, and possibly B. So while the Bush regime isn't guilty of outright lies over the invasion of Iraq - and let's be clear here, the initial cause for war was because Iraq was viewed as an unstable regime supplying "WMDs" to terrorist organizations, not any sort of nonsense liberation campaign... that came later - they are at least guilty of misleading the US population and most of the UN General Assembly as to the exact nature of the threat.
Regardless, any rudimentary student of history can see that the WMD issue was a flimsy excuse to justify a questionable military operation designed primarily as a geopolitical tool to deal with the dual threats posed by Iran and Afghanistan. Military strategists were after a solid base, and at first glance Iraq was an attractive choice. Unpopular leader, local instability, a fairly forgiving tolerance for Western culture among the general populace, not to mention Iraq's physical location - conveniently located between the Saudis and the Iranians. Said strategists made three serious miscalculations:
1. That people must want to support democracy from within, and that it cannot be imposed by a foreign power (there are so many examples of this in 20th century history it's ridiculous).
2. Failure to anticipate how Iraq would become a draw for insurgent forces from Iran, Afghanistan, and Pakistan, all with the motive of bloodying the American nose
3. That Iraq consisted of three very different peoples with very different beliefs and that armed conflict presented the serious possibility of civil war between them...
...which is exactly what happened.
The blunder was to mount a military operation in Iraq with a goal of regional stability. Iraq is and has always been a ****show - as far as geopolitically stable countries go, it's right at the bottom of the list - mainly because Iraq's borders were drawn by what it's neighbours didn't include, rather than what Iraq itself wanted to include.
The real gem, and the endgame, is Iran. It's arguably what should have been the focus following the invasion of Afghanistan in 2001. Iran has a very pro-Western, progressive population which is held to barely a simmer by an oppressive government. While the Iranians would respond poorly to foreign military intervention, if given appropriate encouragement, funding, intelligence, and logistical support, Iran's totalitarian government would have been gone within the decade. It's still quite doable. The purpose of the invasion of Iraq was about nothing so mundane as WMDs or oil - it's about regional stability, and a democratic, progressive Iraq would have resulted in a pro-democractic turnover in Iran. The pesky trouble is Iraq - it just wasn't happening, and the strategists should have forseen it. Knocking Iran off the rogue states' list would have been a major intelligence coup for the Bush administration, but the strategy wasn't implemented properly.
The other major issue is Afghanistan. Troop levels in Afghanistan are ****ing absurd - for the interested folks, compare the numbers of NATO forces in Afghanistan today to the numbers of Allied forces in post-WWII Germany. THAT's how you mount a successful hearts-and-minds counterinsurgency. Afghanistan at this point is a write-off - it'll take a 3-5 decade military occupation with significantly boosted troop levels to effectively stabilize Afghanistan, and that's only if we deal with Pakistan's support for the Taliban, Al-Qaeda, and the myriad of other religiously-based terrorist organizations roaming about that part of the world. No NATO country is prepared to make that kind of time commitment. Of course, Afghanistan was never really the prize anyway - a military response to 9/11 was demanded, the logistical support originated in Afghanistan, and it made an easy target. The trouble was, with the shift to invade Iraq in order to "bring freedom," NATO couldn't very well abandon Afghanistan back to the warlords. Welcome to August 2010 - Iraq is a mess that is ready to collapse, Afghanistan is going to get worse than it was just as soon as NATO withdraws, and Iran is no closer to ending it's rogue state status despite significant internal turmoil. We found the WMDs, though.
Of course, because most of them don't study history, the conspiracy loons have had a proverbial field day with the last decade because none of them can see past their noses (also known as their obsession with oil and hidden/mythical power hierarchies) and grasp the actual military/intelligence strategy that has played out for the better part of ten years and is still ongoing. Newsflash: this is not a conflict of economics, it's a conflict of ideology, and Western secular nations are losing it badly.
But I digress.
I really have to quit doing this; I'm never going to earn a custom title by actually trying to make sense in GD =)