Why are liberals anti-Iraq, yet for Afghanistan?

Do you have any idea how many countries we would be invading if we just invaded every country that supported terrorism? Bin Laden and most of the 9/11 hijackers were from Saudi Arabia, Pakistan doesn't do much about the terrorists within their borders, Indonesia is home to many terrorists, Libya, North Korea, Iran, Syria... You really want those all to turn into Iraqs for the US?