Lets say we find life on Mars, only one life form, but lets also assume that this life form is the key to terraforming the planet into a livable planet for humans at the cost of it's complete annihilation.
The life form is exclusive to Mars and cannot be moved to anywhere in the known universe, nor have we been able to artificially create it's environment in the lab.
The life form immediately dies when it leaves the gravity of the planet.
It gets much of it's energy from radiation and transformation would create an atmosphere that blocks the life blood of this creature.
Do we proceed?