If Bush was deceived by Saddam, and the WMD's were moved to Syria or overlooked in Iraq, Bush still bears the responsibility for the failure to locate the WMD's, being hoodwinked by Saddam into believing there were no WMD's and for letting the WMD's fall into Muslim hands
If Bush was not deceived by Saddam, he bears the responsibility for failing to realize that Iraq did not have WMD's and consequentially overreacting. He had three years and the world's largest intelligence network at his fingertips to figure out whether Clinton's CIA guys were right or not.
Again, whether there were WMD's or not is really a moot point here; Bush messed up strategically either way you want to look at it.
Let's set the context first. We were in a state of war with Iraq, under a cease fire.
I left out the 500,000+ people Saddam had killed because, after all, neither you nor I care about those filthy little brown people. Right? /s
And those agencies, as well as those around the world, ALL had the same intelligence and evidence of WMD's in Iraq. And we did find some. Sarin gas ended up in Jordan and was used in a failed attack in that country. I think the key word everyone ignores was "stockpiles".