Amnesia in Female Characters

Here's something I've recently noticed. Why is it that amnesia/memory loss is often considered the "best thing" for women who have experienced difficulty? And oddly, it's often the strong, heroic women who "need" to forget. Here are some examples of this occurrence. The only U.S. equivalent that comes to mind, oddly enough, is the I Dream of Jeannie TV-movie in which (if I remember correctly) the man loses his memory, and the family must start over again....

Perhaps one cultural clue lies outside of Japan, in China. There is apparently a myth of a woman who excelled in the military and who fought amazingly well, but then returned to her home to obediently serve her husband when she had accomplished what she needed to do. There may be some remnant of that "domestic bliss is best for a woman" attitude around here somewhere....