In my experience though almost every one of these aggressive angry people is quietly ashamed of their anger. They may not even be aware of it themselves, but that shame is what keeps it held together. They can never approach their anger because it feels so deeply to them as if their identity is that aggressive angry person, and so attacking their anger only makes their very identity feel threatened (even if it's not an identity they want). Attacking people is actually a way of protecting themselves.
I've had this experience multiple times in my life with bullies. Somehow trying to understand them even in the face of their anger allows them to relax and let down the offensive (although that of course does not mean letting them cross my boundaries).
People who've learned that form of interacting with other people have almost certainly had difficult lives. That doesn't mean to excuse them and allow them to run riot over everyone else, but the thing is attacking them is counterproductive and only puts up their defenses.
The bully-victim dynamic happens because one person is used to crossing boundaries (even if it feels bad) and the other person is used to allowing their boundaries be crossed (even if it feels bad). The bully explicitly seeks out those who have (through no fault of their own) been taught to allow their boundaries to be crossed. In both cases the mistaken belief is the same - that crossing boundaries is normal.
If you're interested in this more I highly recommend the 2017 documentary The Work: