It was for the fish, the birds, the mammals and anything in the food chain that depended on them... If spilling thousands of barrels of oil into the sea is no problem... Understand your point, but this issue you are marginalizing.
Chuckle, if a massive oil spill is construed to be a WMD, what does that do to the liability of oil companies when their oil tankers run aground?
(for more fun, consider the Exxon Valdez and Captain Hazelwood... and possibilities.)