This is the mind-numbingly stupid thing that columnist Lorie Byrd actually wrote (apparently, in earnest), at Townhall:

What is rarely, if ever, addressed by the opponents of President Bush and the current war is whether or not the decision he made was a correct one if everything we thought about the status of Saddam’s WMD capability had been correct.

In other words, invading Iraq was right because in a hypothetical world, Iraq could have had WMD. 

The next time I give a poor performance in the sack, I’m going to turn to my complaining lover and say to her "Yes, but can imagine how I would have been if I were good?"  That should shut her up, according to Byrd’s logic.