Why do we, psychologically/philosophically speaking, put such an emphasis on

Why do we, psychologically/philosophically speaking, put such an emphasis on things being "real"? What got me thinking about this question is the nature of our memories - while I can certainly recall some "half-memories" which probably never actually happened or even simply fabricate some, why do we place less value on these memories than "true" ones, even though they could theoretically have the effect on us?

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