qwkxinw ri kiawecukkw [ROM07.15] vyr si u wcwb q0br ri vw fiis?

Why do so many anime films/shows have such a strong theme of memory? I watched Cowboy Bebop the Movie tonight. The loss of memory seems to drive one of the characters and knowing what I know about the series Faye is missing memories and Spike is living a second life of sorts, but ultimately can't escape the first one. There's a movie called "A Wind Called Amnesia" or something like that. In that movie everyone on the planet has lost their memory. There's a TV series that's airing on the Cartoon Network name "Big O" in which the whole of civilization has lost its memory. I guess those are all the examples I can think of. It just seems odd that there are several examples of people trying to cope with life without personal history.