Although, these two are, peas in a pod, however, there’s NO way of telling, which came before which!
There may be this, positive correlation of anger and fear, because, anger and fear, they seemed, unrelated at “first sight”, but, if you think about it, they’re like, close siblings.
The experience of anger, is so strong, and, it’d, stemmed, from the fear of something, and, because you didn’t take the time to understand why it is, that you’d, feared something, that, is why, you’re prone, to react angrily, as whatever it was that you’d, feared, come up in your life, to mask up your own fears of it, because you were taught, to be strong, that you shouldn’t, show ANY sign of fear, as that, is a sign, of weakness, and, you won’t be, labeled, as a “weakling” now, will you? Of course N-O-T.
As for, whether anger causes fear, or, fear causes anger, I don’t think, it’ll be, conclusive, ‘cuz these two usually, coexist together, without the fears, the angers couldn’t grow to become so strong, and, without the angers, feeding, to the fears, the fears couldn’t, get blown out of hand either!