But that's a shitty incentive to betray Panam anyway, I would have prefered there was an option to convince her to leave the clan.
Well, you won't be able to sway her mind, no. In the end, you know exactly what you are getting into if you team up with her. Either put up with it, or go your own way.
It's not exactly a shitty reason. If you really think that this sounds like a suicide mission, it's a reasonable way to act. In character, you wouldn't know how the mission ends. It's only with the knowledge how this plays out that you think that mission is a good idea. Or "game logic": trust that the game won't send you on a mission that will fail in an uninteresting way.