Hussein is NOT " more of a threat " now; he's less of one.
There were WMDs in Iraq. Some, may still be there, whilst others were probably moved into Syria and other places.
Iraq had the knowledge and making of " dirty bombs ". That's a recent find. al Qaeda talked about stting one or more such off in the USA. Saddam WAS in contact/sheltering some al Qaeda members.
For over 12 years, Saddam not only thumbed his nose at the UN sanctions, but made inspectors leave. For that alone, we should have gone into Iraq.