It's not that hard of a concept. Jon let the wildlings past the wall because he thinks they will need everyone to defeat the White Walkers. He went south to recruit Danny's army and dragon glass because he thinks he needs them to defeat the White Walkers. They want to recruit Cercie because they think it will take everyone to defeat the White Walkers. Danny also doesn't want to just turn her attention North because Euron and Jaime have already won two of the three battles against her.
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