Why don't they just eject those chemical weapons into outer space? Even though its expensive, it's safer than just dumping it into the sea. Our generation might not suffer the consequences of this. But our children, and grandchildren will surely suffer from these environmental pollution.
Because space isn't this thing where you eject stuff like a garbage chute.
I recommend reading up on rocketry, orbital mechanics, and modern space programs because a) it's really cool stuff! and b) you'd quickly realize how ridiculous, dangerous, and counterproductive this suggestion is.