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Its good that this isn't something people can automatically do. We remember for a reason - it keeps away from the danger. If we could not remember what or where was dangerous we would keep falling as prey over and over again.
Forgetting can make you smarter. A new review paper proposes that the goal of memory is not to transmit the most accurate information over time, but to guide and optimize intelligent decision making by only holding on to valuable information. Source 4g.