Speaking of a Silly Poll

[Lalaith]

For what you ask? Kuru, you *have* forgotten the Fen of Serech, haven't you?

The men of Dor-lomin sacrifice themselves so that Turgon and his boys can sneak back to their sodding hidden city. Hurin is captured after performing feats of arms and courage unmatched by any elf or man on Middle Earth before or since. For this deed, and for facilitating Turgon's escape, he and his kin are tortured for years by Morgoth. On release, he asks the elf for whom he offered up this incredible sacrifice, for refuge. Turgon refuses.

If that isn't ingratitude then I would like you to tell me what is.