The memories would be transferred into the minds of the community and they would have to bare those memories themselves. :D
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The giver would likely say that Jonas left the community to save his baby brother Gabriel and find a new place that values freedom, emotions, and individuality. He took with him memories that would help future generations avoid repeating the mistakes of the past.
he would be sent back to the community so no one would have to suffer through the memories
They believed that once he left the community that all feelings, emotions, and memories would be transported into the minds of everyone in the community.