Since Iraq did not possess WMD stockpiles in 2003, your assumption that Hussein had WMDs would be wrong.
Assuming that someone is innocent of accusations until proven guilty isn't stupid, but was the foundation of our criminal justice system. Now we just assume people are guilty and shoot them and anyone else who gets in the way.... or torture them for years without due process. Our criminal justice has reverted back to the middle ages when people were tortured until they confessed and then lynched by an angry mob.
It is not a court of law....it is war.
You hunt your enemies, and you kill them where you find them..........
Or they kill you.