"Whoever you are, I have always depended on the kindness of strangers"

Blanche comes from a world where women seek protection from men.  Her world is defined by gender expectations: the women are pure and await the gentleman callers who will provide strength and protection.  If  Blanche is a tragic hero/heroine, then she must be lucid when she says this line to doctor at the end of the play.  Comment on the implications of what she is saying, if this is so.