Well, I've heard the saying, "Drunken words are sober thoughts," but I don't agree with that. I'm a sober alcoholic and I did/said a LOT of things in blackouts that made no sense to me when I got sober. I mean, awful, nasty things to my husband and my children that I would never have done without alcohol and would never have done intentionally. One thing I WILL say is that alcoholics tend to have a lot of problems with expressing anger appropriately ... we tend to "stuff" feelings. So when we get drunk, all inhibitions go out the window and we lash out at whoever tends to be available, even if they aren't the cause for our anger.
I don't know your wife or her issues but it sounds like she definitely has some anger/rage going on there, which is typical of us alkies. Have you tried talking to her about this when she isn't drunk?