Good fathers do not beat and murder the mothers of their children, regardless of the outcome of their separations.  There is no known psychological term called snapping--that is a myth. Domestic homicide is one of the most common and frequent types of murder in the US where one third of all women murdered are killed by their husband, boyfriend or former partner.  You can spin your rhetoric all you want, but you are making excuses for murderers, plain and simple, and then alluding that such people should have custody of children.