<<My view, which MT will disagree with, is that Bush has done so not because of meanness but he simply made incorrect decisions. I believe there was no spite or cruelty or conspiracy theory surrounding oil. Again, I present the idea that Bush really sensed there were WMDs in Iraq, so that is why he authorized the invasion>>
It just makes no sense at all. The Project for a New American Century, authored mainly by rabid Zionists, including Robert Zoellick, Paul Wolfowicz, Eliot A. Cohen, Elliott Abrams, Richard Perle, all of whom (with the possible exception of Cohen) served in the G. W. Bush administration. Donald Rumsfeld was another author of the PNAC, also prominent in the Bush administration. PNAC proposed a U.S. invasion of Iraq as far back as the Clinton administration. Bush's entire administration was permeated with Zionists and PNAC members, long-time supporters of an invasion of Iraq, and some of them (including Douglas Feith, not particularly associated with PNAC) and Perle had actually worked for the Zionist government before coming into the Bush administration. Iraq at the time was a major enemy of Israel, and taking out Saddam Hussein was obviously very much to Israel's advantage.
Again Bush's idea that there were WMD in Iraq is (a) dead wrong (b) was sourced exclusively by sources which could all be traced back to the Iraqi National Congress of Ahmed Chalabi, which had a very obvious interest in regime change and (c) was not sufficient to convince France, Germany, Russia, India, China, Canada and many other countries that the "threat" required invasion when Bush invaded anyway.
Furthermore, the issue is a red herring. It was never established that possession of WMD by Iraq was any kind of threat to the U.S.A. as Iraq had never used WMD against the U.S. in any prior conflict. In fact, it was obviously suicidal for Iraq to attack Americans or America with WMD, thus extremely unlikely.
You can't invade another country on pure speculation of what they "might" do - - that's an outrageous formulation of what's acceptable international conduct and of course it's a pretty basic concept so there is no doubt at all that Bush understood this as well as anyone else. The claim of WMD was not even meant to be taken seriously for the simple reason that it made no sense at all. It was a smokescreen or fig leaf for a decision already taken, back when first formulated by PNAC, that the U.S. should invade Iraq, an oil-rich nation. The reason for the invasion could be presented later.