Because what you were just talking about is in short term memory, which has limited space and holds things only for a short time. Most thoughts we want to forget are usually already in our long term storage, which has more space and is as close to permanent as any of our squishy body parts.
That being said, if you’re wanting to forget something traumatic that just happened, playing Tetris or word games has been found to be helpful for keeping intrusive memories from developing.
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