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Why don't we kiss the tzitzit during the Vayomer section of shma of maariv? I would think we would since we are reading the same text as we do for shacharit.
There is no Miswa of Sisit at night (see Rabenu Behaye to Numbers 15:38-39).
As seen in the Mishnah in brachos (I think it's the end of the first perek) the only reason we say vayomer at night is because it references yitzias mitzrayim. In theory, we don't really care about the tzitzis mention.