If "one character" is very angry at "other character," then the "other character" has done something very bad to "one character" or to the characters they cares about, and the "other character" has to take responsibility for what they did. Usually that's how it is on other shows.
If this "other character" is Jax, could this work?
Because usually someone who has anger issues is considered the same as a jerk, so I think one reason she understands Jax is because she feels like she finally belongs to someone who emphasizes negative traits more.
And remember, "made sense" here doesn't mean I'm excusing Pomni for sympathizing with Jax or defending her actions, I just want the seeds of their relationship to be made clear!