several solid reasons... then why did he send Colin Powell with his powerpoint presentation to the UN security council to convince all of us that Saddam was a threat to the region and the world?

I think the end justified the means. Geopolitical interests in the Middle East required no reason other than the one that would make the US look benevolent in the eyes of possible allies.

Do not kid yourself. If there was no suitable reason available, one would've been fabricated. In fact, I think that already happened.