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That's not the point, I was just giving an example. It could have millions of effects and whether evolutionary selection would favor these genes is not trivial.

> Why would a memory enhancing drug only increase rememberance of negative memories and not the positive and loving ones?

There's a psychological phenomenon:

https://en.wikipedia.org/wiki/Negativity_bias

it would increase both, but negative ones can have bad, debilitating consequences in life (cue PTSD, phobias)