The fact is that if Saddam has these weapons he will threaten to use them sooner or later. If he decides, once he attains nuclear arms, to invade another of his neighboring countries, and the US intervenes, he will use everything at his disposal at that time.
It's not a matter of if, it's a matter of when, imo.
We can either attack him now, on our terms, or later, on his.
Millions would have been saved IF the various nations had had the guts to stop hitler when he first started his aggression against the world.