I don't think Dain really believed in Balin's little "Questlet." Since he had looked into Moria, and seen the Balrog (although probably not face-to-face), he knew that there was no point in trying to set up a colony there again, because the Balrog (and Orcs) would just destroy it. He couldn't hold Balin back, so I guess he just let him go, and figured if he didn't come back, people wouldn't try leaving.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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