I wouldn't do either one. That's a dumb choice, you are "setting him up. Here's your choice: What's more important? Proven material for the insulating foam? or a "more environmentally friendly" alternative which caused the death of 7 astronauts?
I agree they were victims. Of ignorance over experience. Political correctness sometimes kills. Someone usually makes that choice.
NASA operates at the whim of Congress. You got a beef over that issue? Take it up with the enviro-whackos and the jackwits they own in Congress, pal.