Their are those on the Left who actually believe that Israel is responsible for Gilad Shalit not being free - because we haven't compromised and appeased Hamas enough (as opposed to those who think he isn't free because we held ourselves back in the last war to avoid enemy civilian casualties).
But Neturei Karta believe there is no Mitzvah at all to free Gilad Shalit.
I would reverse that question and ask, would there be a Mitzvah to free a captive if he were from Neturei Karta?
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Wherever I am, my blog turns towards Eretz Yisrael טובה הארץ מאד מאד