"The discovery of numerous caches of chem protection suits and atropine auto-injectors does make me wonder just who the Iraqis thought was going to use chemical weapons on whom."

Any potential enemy who happened to have them. That could mean the USA, Russia, Iran, Israel...

Why would it be improbable that Saddam would think along the ines "Well, If I did it, why should I assume they won't if it suits them"?

As Doug said, we'll see soon enough, one way or the other. The idea that in a life and death situation Saddam is going to refrain from using weapons he has at his disposal, just in order to embarass the invaders politically, does not seem too plausible. After all, if he was running the invasion it seems fair to assume he'd plant the required evidence if it was needed, and he'd be likely to take it for granted his enemies would do the same. So there'd be very little political gain to be made in any case.

If he does have them I think it is quite likely he'd use them initially in such a way that it appeared that it was the Americans who were deploying them.