You're making a case for why those emotions are justified. My contention is on the consequences of acting out on the two specific ones I mentioned.
The rhetoric of it all sounds good because we can identify with it, which is also partly where the "feel good" sensation comes from. This principal isn't an exclusively Black issue. Look at the revolutionaries around the world and you'll see the ones that took hold (for the people) and the ones that may have had good intentions but soon imploded. Anger and frustration are doorways that oppositions use to foment confusion, dissension and internal conflict.
And all of that happens as you're confronted with the reality that neither one of those emotional states produces solutions to problems EVER! Not in reaching Black people and not in your daily life at work or at home.