The Hague would disagree with you on that:#7 The "genocide" was not even genocide. It was the slaughter of people in one small area. Millions of them still exist. There was never any attempt to wipe them out. The correct term is "mass murder".
BBC NEWS | Europe | Killing of Iraq Kurds 'genocide'
In relation to chemical weapon facilities, it should depend on where the weapons are stored and how close they are to civillian population. One would hope that this is something that is being taken into into consideration.
In light of the above, I imagine that a US strike scenario would be limited to destroying conventional military assets (i.e. airfields, motor pools, etc.). The aim here is to send a strong message, but not militarily decapitate the SA.