is it better to will ourselves to forget the unpleasantries so that they never occured? doing so involves denying our memory. but what do we lose by doing so?

if we could erase part of our past and create a rupture of unpleasant memories, so that the world could be a much nicer place, would we do it? what do we lose by doing so?

our identity? our sense of "self"? but what do these matter if we could become Adam and reconstruct everything from the beginning?