And he was scared of Ungoliant, and we don’t know what she is, besides nasty, and hungry, and shaped like a huge spider (well, spiders are shaped like her, probably).
(He also got his foot almost cut off by an elf in single combat and walked with a limp ever after — well, at least until he got his hands and feet cut off by the rest of the Valar, I suppose —, but elves were mighty back then.)
COVID showed us that when we close the borders it’s already too late.
American avian flu will be global long before enough other governments take it seriously enough to react, because the people who should have raised the alarm (in the USA) will be too busy looking for a job, in jail, dead, or ignoring it and drinking raw milk.