"any more than" and "more"

“I don’t hold A responsible for B any more than C should be held responsible for D.”

The meaning could be different depending on what you replace the letters with. Just replace A, B, C and D with names or events.

For example:
A = George Bush
B = 9/11
C = a cow
D = the rain

I don’t hold George Bush responsible for 9/11 any more than a cow should be responsible for the rain.

If a native English speaker reads this he/she will think that the writer does not hole George Bush responsible for 9/11 at all. The reason he/she thinks that is because it is obvious that a cow is not responsible for the rain. The writer is comparing the levels of responsibility, and since a cow is not responible for the rain, George Bush is not responsible for 9/11.

You could, however, write this to read a bit differently:
A = a father
B = a child
C = a mother
D = a child

I don’t hold a father responsible for a child anymore than a mother should be responsible for a child.

In this context a native speaker would think that you hold a mother and a father equally responsible for a child. Because a mother is supposed to be responsible for a child, and a father is supposed to be responsible for a child. The writer is saying that neither one has more responsibility than the other.

Thank you for your detailed explanation.

Outlook: Nine years after 9/11, let’s stop playing into bin Laden’s hands http://wapo.st/bLKylk