Edward

Returning home with a blade dripping with blood, Edward must be questioned numerous times by his mother before he admits whose blood it is...his father's.  While this technique was obviously used to build up suspense, it seems to also ultimately place responsibility for Edward's murder of his father upon the shoulders of his mother.  In the end, he curses her for the counsels she has given him that made him commit this vile act.

It goes without saying that Edward himself is responsible for the murder of his father, regardless of the advice whispered into his ear by his mother.  Yet Edward himself does not see this, or at least not to the extent that he takes full responsibility.

Blaming others for one's mistakes is nothing new.  It does, however, seem more prevalent today, where everything seems to be somebody else's fault.  If another individual is not directly to blame, then it is one's life circumstances, one's childhood, one's marriage, the stresses in one's life, etc, etc.

Ultimately, everyone is responsible for himself, no matter what may have led to the circumstances one finds himself in.  Blaming others is just a way of deflecting the blame, thereby losing the opportunity to learn from adversity, and grow.  Adults accept the fact that they are responsible for their own mistakes.