Necessity is the mother of invention. For them to continue thriving as the last of the Numenorean race, they need a place to call their own--and fast.
Didn't the War of the Last Alliance happen a long time (relatively) after the Akallabeth? Because if so, it's understood why the host of Men and Elves was great in number in spite of the fact that those who were saved from the Downfall were but a fraction of it.
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