I think you need to learn enough about these people to see how it might appeal to them on an individual level. You are outclassed by your goals, even if your ambitions are coming from a good place. [If she were older and had more weight, it would be different. But she's not, and Lexa can tell she was never prepared for this particular life.]

If you come out at the end of that learning experience believing that peace is the answer for everyone, then you can broach it. But you will be all the wiser for it.