The answer to your question is yes.
Sadaam Hussein is rational enough to understand that he will not and should not use whatever weapons he has against us, until we invade his country. Invasion on our part will give him more legitimacy to use whatever weapons he does have, against us.
Invasion on our part is justified, but we have to consider the results of our actions if we do.
And Israel?
Kuwait?
Turkey?
His own people?