I'm of the personal opinion that "back dating" the Domestic Abuse Laws as it pertains to gun ownersip/usage is against the rules of fair play, akin to the losing side changing the rules of Dodge Ball once they start to lose.
If, when the law was passed they said, "Anyone convicted from this date forward for Domestic Violence is barred from owning a gun" then I wouldn't have a problem with it, as we would all know the rules of the game before playing, or at least have access to the rules, and should know the ones that are important to us. If they can do this what's to keep them from passing a law that says, "Anyone convicted of speeding since 1932 is barred from owning a gun." That's not fair, and while fair is a place you go to eat cotton candy, it is deceitful and underhanded IMHO.
Biker