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They rely on them because they're in a rare-disease support group with you; or they all coordinate their kids' little league carpools there; or that's where they stay in touch with family and friends they left behind when they emigrated; or they're customers or the audience for creative labor.

All those people might want to leave, too, but it's really hard to agree on where to go, when to go, and how to re-establish your groups when you get somewhere else.

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