[SarahW]

And quit playing word games. Post-partum depression can make a mother a danger to herself or others...but for the brain disorder, no murder would have occurred.

[hopespringseternal]

but for the brain disorder, no murder would have occurred.

That is more assumption than fact. In every case, there have been serious moral flaws in addition to the disorder. Depression and homicidal mania just aren't the same thing.