@banjomarx
Your point doesn't stand, though, because in neither chapter did she say they were good guys. The closest she got was saying that he should decide who was a good guy or bad guy from direct interaction, instead of just what others say. That doesn't mean they are "good" though. What she did say was that the SLA being at her place was troubling. She seemed to want him to hear what the one guy had to say, so that he would know more of their aims, and decide whether to join them, to join the opposing faction, or to start his own faction. She seems to be encouraging him to do something to stop the SLA from winning in this chapter, even.
None of this, though, needed to be avoided beforehand. She told him the SLA were there, and making a barrier, so if the knowledge of the presence of the SLA would have kept him from going, or made his companions try to stop him, then she already revealed that. The thing that I've wondered for a while now is if, because he "reincarnated" here, if that means he himself counts as a spirit (since he could enter a barrier that "lets spirits in, but keeps humans out" and if he is similar to the "Great Spirits" since they can be seen by other people, and he can't use magic himself). Since she said to remember the specific statement that the barrier only lets humans in, and because he might not accept the idea of being a spirit yet, that could be an explanation. He might count as both spirit and human, but they've been talking about him learning about who he is this whole time.