For a girl, even if is a cop, reputation and not ruin a relationship is important. Ok, not all girl are at same point but for Jen this really care.
That two undead grandpas only take advantage of her weakness ... the fear of ruin her relationship, and btw is even the point of this entire game. If your heart go in negative is game over, so ... maybe you can be upset but is worth on storytell.
I could try to explain in another way. On my first time I saw Battlestar Galactica, I feel an incredible hate to dr Gaius Baltar and that hate I had projected on actor too. Of course that was wrong, cause rewatching entire tv series I had only to enjoy the performance of actor (James Callis), because his character is a piece of shit and he act good enough to receive that impression.
Your "two undead grandpas" are like the actor, they getting an advantage that overtake most of common moral's rule, but you don't have to pissed off because that ... cause is part of story. She can't arrest them since she care about her reputation and relationship, she could arrest only after she brake one or both her "weakness" (that are not but let me pass this word).
For your information, her corruption is raising, so ... in a future maybe you can be happy to arrest them if she break the "reputation" rule. I hope anyway that will be a choice for the player.