Rest in peace.
There is a distinction between lying and telling people something that is incorrect. An honest man can only tell you what he believes to be true.
He learned later that the information he used to tell the world that Saddam had WMD, and that we thus had justification to go to war, was incomplete, or in some other way compromised. He did not know it at the time.
I believe this true of Bush, too.
It is also true of all of us that the desire to believe true what we want to believe true is often overpowering. It doesn't mean we are all evil. It means we are all human.