"Joshua speaking: then what do you propose we do, Detective? If the stakes don't matter, if the weight of our responsibilities means nothing, then what are we supposed to do?"

Biochemistry won't get them out of this, if what Detective Sousa is saying is the truth. They can't open a closed biosphere; they can only remove extraneous material from it, and if they're the extraneous material then they'll die.

And that isn't acceptable.