It does if you are trying to build confidence in the Iraqi people. There are also numerous other consequences that could result from acknowledging their existence. If you acknowledge he had some, then the question is how many did he have ? Have all of them been found ? Where did they go ? Did Syria get some ? If Syria got some and we officially acknowledge that they could have gotten some, that act alone could provoke Syria into using whatever they did get. If we told Israel that Syria got Biological and Chemical WMD from Saddam while we were diddling with the UN, would not Israel consider a first strike to prevent their inevitable use on Israel ? If we acknowledge that some nasty WMD existed and that we may not have found all of them, what about Iran ? Would they be justified to invade to help us locate the Loose WMD ? What about if we know that terrorist got their hands on some of the chemical and biological WMD ? Would that not frighten a lot of people ? Perhaps it would be best to deny the existence of the WMD in the first place while we hunt down those terrorist. Not saying any of this happened or is happening, just illustrating some valid reasons to deny the recovery of WMD.
Personally I think the M1 tanks should have gone all the way to Baghdad after we destroyed Saddam's Kuwait invasion force. But as they say, hindsight is 20-20.