I would say angry cardio: HELLS YES. Angry strength training: only after you burn most of your anger off with cardio. Weights require control so you don't injure yourself, so if you're too angry to focus it and do the exercises with proper form, I would skip them. I usually pop in a tae bo or kickboxing DVD if I'm really pissed off and let it all out with the sweat. Hope you can find peace with or without the workout!
*kitten* IT, lift hard, lift heavy, you should feel better after you are done...